Re: [SlimDevices: Audiophiles] free upgrade for linux LMS users
Wombat wrote: > I knew ULTRA makes guys horny, look further, it is out there! Yes it does ;-) Can't seem to find it though, a link would be apreciated. :p ---- tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=106375 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] free upgrade for linux LMS users
Checked the source code (rate.c) of latest sox from git.
Code:
static char const * lines[] = {
"[-q|-l|-m|-h|-v] [override-options] RATE[k]",
"BAND-",
" QUALITYWIDTH REJ dB TYPICAL USE",
" -q quick n/a ~30 @ Fs/4 playback on ancient hardware",
" -l low80% 100 playback on old hardware",
" -m medium 95% 100 audio playback",
" -h high (default) 95% 125 16-bit mastering (use with dither)",
" -v very high 95% 175 24-bit mastering",
" OVERRIDE OPTIONS (only with -m, -h, -v)",
" -M/-I/-L Phase response = minimum/intermediate/linear(default)",
" -s Steep filter (band-width = 99%)",
" -a Allow aliasing above the pass-band",
" -b 74-99.7 Any band-width %",
" -p 0-100 Any phase response (0 = minimum, 25 = intermediate,",
" 50 = linear, 100 = maximum)",
};
Nothing about an ultra quality mode?
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Re: [SlimDevices: Audiophiles] free upgrade for linux LMS users
Guys in my first post I already stated that the improvement I heard is subjective and not a proven fact. I will stop posting now in this thread, as I do not feel like participating in a bullshit or not bullshit kind of discussion. I just wanted to share my personal subjective experience and technical solution for this, thats all. Ronald tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=106375 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] free upgrade for linux LMS users
Julf wrote: > /tmp is a real file system, so of course the files get both read and > written. /dev/null is a special case. It works with /dev/null, the amount of cached bytes increases with the size of the copied file. ---- tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=106375 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] free upgrade for linux LMS users
Apesbrain wrote: > Yeah, I'm just going to go ahead and call bullshit on this. Having an opinion is fine, but getting personal does not help a lot most of the times. ---- tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=106375 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] free upgrade for linux LMS users
drmatt wrote: > You would have to check the system call activity behind this command. > You might find that the cp command recognises that its output is invalid > and never does the reads from the source file. . This was simply tested by first using /tmp instead of /dev/null, the played tracks were indeed copied to /tmp. tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=106375 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
[SlimDevices: Audiophiles] free upgrade for linux LMS users
After noticiting that playing a track for the second time it sounds
better then the first time, I did some research.
The second time a track plays, its read from the linux OS disk cache
instead from disk. This means the track is played from RAM memory
instead of from the hard drive that containt the file (track).
So I was looking for a way to copy a track to RAM memory before it is
being played. I came up with a very simple but effective solution that
works fine.
By modifying my custom-convert.conf from:
Code:
flc flc * *
# FT:{START=--skip=%t}U:{END=--until=%v}
[flac] -dcs $START$ $END$ -- $FILE$ | [sox14.4.2] -v0.98 --buffer 32768 -q -t
wav - -t flac -e signed -C0 -b24 - rate -v -M -a -b 90.7 96000 dither -S
to:
Code:
flc flc * *
# FT:{START=--skip=%t}U:{END=--until=%v}
cp $FILE$ /dev/null; [flac] -dcs $START$ $END$ -- $FILE$ | [sox14.4.2] -v0.98
--buffer 32768 -q -t wav - -t flac -e signed -C0 -b24 - rate -v -M -a -b 90.7
96000 dither -S
Search for the difference ;D
It's this:
cp $FILE$ /dev/null;
before the sox upsampling command.
What this does is: copy the file (track) to the null device. This is
very fast, because the null device is virtual and does not require disk
writes. As a result the file (track) has been read once from disk and is
now in the linux disk cache.
On the OS level I could test and prove this really works! So all music
tracks now play from RAM memory, resulting in a more stable stereo
image. And yes that is very subjective ;-)
Maybe someone else likes to try this as well :-)
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Re: [SlimDevices: Audiophiles] Better resampling for SB Classic and Touch (probably all)
Personally I still prefer the polyphase upsampling from sox 14.2 -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=84462 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Switching to slow rollof filter in AK4396
Can't wait to try. So thats exactly what I will do, going to try right now ;-) -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=76763 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Switching to slow rollof filter in AK4396
Bummer... There only seems to be a windows version available :-X when will there be a new beta of the linux (debian) version? -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=76763 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Switching to slow rollof filter in AK4396
andyg;568593 Wrote: QA is going to start testing TP firmware 84 today for 7.6 beta so it should have this in there too. :) I had totally forgotten about this topic. Thanks a lot Andy for doing this! :-) -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=76763 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Disabling Transporter wireless
Simply remove the wireless mini pci card from the transporter, thats what I did ;-) -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=76793 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Switching to slow rollof filter in AK4396
Wombat;530010 Wrote: I asked that already in another thread but none of the developers answered. In theory it should be set in the same way the Transporter chooses polarity. Only one flag in a register. Sadly i have the feeling the Transporter is seeing EOL soon and no one from the devs want to change anything on the Transporter anymore. Ok, so I wasn't the only one who was wondering. I think slow roll-off might be sound better ( but measure worse). -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=76763 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
[SlimDevices: Audiophiles] Switching to slow rollof filter in AK4396
Hi, Would it be possible to make the choice between slow and sharp rolloff filter in the AK4396 (transporter) user selectable? Personally I would be very interested to compare (subjectively) the difference. Ronald. -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=76763 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] transporter balanced output?
Yes, balanced sounds better, even when using one leg to an unbalanced input of an amplifier. This is explainable because one opamp/filtering stage is omitted this way compared to the unbalanced output of the transporter. -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=76644 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Transporter samplerate
Today I also tried some 192...@24 bits flac files on my transporter (squeezeboxserver 7.4.1), they play fine. Are you sure these are being downsampled?? The AK4396 is pefectly capable of handling 192 khz samplerates. Ronald. -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=57631 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] External DAC - does it make a difference?
ninjikiran;519719 Wrote: When using a device as a transporter(as long as nothing is changing in software) I see no reason for audio to change in quality. When using a digital out on any transport it should be the same no matter what. 1's and 0's can't be colored in such ways unless done purposefully by the device(equalizer or re-sampling). Don't forget that these 0's and 1's have to be clocked by a very stable clock, that's where the difference is in sound between digital outputs, not the 0's and 1's. Ronald -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=75447 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Antipodal filtering
michael123;516461 Wrote: - What was the command line for minimum phase? - Which SoX version did you use for polyphase and rabbit? Could you please post command line as well? Hello Michael, Sure, I compared these: Code: /usr/share/squeezeboxserver/Bin/i386-linux/sox -v0.965 --buffer 32768 -t flac -r44100 -2 -c2 original.flac -t flac -C0 -3 -c2 -r96000 rabbit.flac rabbit -c0 Code: /usr/share/squeezeboxserver/Bin/i386-linux/sox -v0.965 --buffer 32768 -t flac -r44100 -2 -c2 original.flac -t flac -C0 -3 -c2 -r96000 polyphase.flac polyphase -cutoff 1.0 Code: /usr/share/squeezeboxserver/Bin/i386-linux/sox -v0.965 --buffer 32768 -t flac -r44100 -2 -c2 origineel.flac -t flac -C0 -3 -c2 -r96000 -D rate -Mav -b 85 It was clear (for us) the rate method was sounding worst. Rabbit sounds quite good and with some advantages over polyphase (cleaner highs, very detailed and precise) but polyphase sounded the most musical with a bit more body to the sound. Ronald -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=69145 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Antipodal filtering
michael123;516524 Wrote: took me couple of hours to integrate polyphase back into 14.3 Did you use polyphase -cutoff 1.0 ? Yes I used -cutoff 1.0, tried 0.85 as well but we preferred 1.0. I also tried to integrate polyphase into 14.3 source code and thougt it compiled without errors it didn't work :-P Is it maybe possible to send me the 14.3 modified source code (or diff) ? I also saw (in the source code) that the new resampler in sox 14.3 can simulate polyphase (have to lower cutoff value to 0.997 though or it won't work) or rabbit. Did not listen to this yet. Regards, Ronald -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=69145 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Antipodal filtering
michael123;516615 Wrote: I think polyphase returned me some 'punch' I was missing with the 'rate' effect Yep, it has more body (in a positive way) to the sound and almost sounds a bit tubey :-) -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=69145 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Antipodal filtering
PM sent :-) -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=69145 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Antipodal filtering
Yesterday me and an audiophile friend compared the rate upsampling with minimum phase filtering against polyphase and rabbit upsampling. We clearly preferred polyphase AND rabbit over rate with minimum phase. Its a shame those 2 upsampling methods have been deleted since sox 14.3 -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=69145 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Antipodal filtering
DaveWr;512921 Wrote: See page 5 of this post. the Transporter is a 4 bit DAC with sophisticated pre DAC up-sampling filters and dither algorithms These are the actual filter points that Meridian uses in its solution. Your approach is not the same. Dave The data sheet of the AK4396 states that it does 128x oversampling, which is part of the sigma delta design in my opinion. There is nothing in it about upsampling But ok, I do of course agree that whatever parameters used with sox, there is no way to work around the existing filters in the DAC. -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=69145 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Antipodal filtering
This topic mentions creating a wav file representing an impulse. Does anyone know how to create such a sound file? I would like to experiment a bit as well with comparing impulse responses ;-) -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=69145 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Antipodal filtering
michael123;512671 Wrote: nice plz let me (us) know what did you get from each filter, and what did you like the most Sure I will! However, the differences were small (or maybe I was tired yesterday..) and I was not able to draw any good conclusions. -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=69145 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Antipodal filtering
By the way, there already is a nice collection of graphs on the sox website that shows the impulse response for different rate parameters when upsampling from 44.1 to 96 kHz. +---+ |Filename: rate-44k1-96k.jpg| |Download: http://forums.slimdevices.com/attachment.php?attachmentid=9193| +---+ -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=69145 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Antipodal filtering
DaveWr;512912 Wrote: Still don't forget the up-sampling filters in the Transporter Dave Which upsampling filters? As far as I know the transporter does not upsample at all (?) If you ment the DAC filtering, then yes they will do their job as well. -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=69145 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Antipodal filtering
I am also listening (as we speak) to the difference between minumum phase vs lineair phase, limited bandwidth (85%) versus less limited (95%), polyphase versus rate -v. Pf, drives me crazy ;-) -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=69145 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Transporter wish list...
Personally I would love to have the transporter in an old fashioned hifi component look (but with the display of course). -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=69447 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Transporter wish list...
A better analog output stage. After rebuilding mine with discrete opamps (burson audio) it sounds significantly better (more 3D and more analog, more resolution and less agressive highs). -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=69447 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Squeezebox plus, does it still exist?
Thanks for all the info. I am actually more interested in the digital output of the SB3+ since I already got a very good DAC (PS Audio Ultralink II). I'll certainly give the SB3+ a serious thought ! -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=49942 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Squeezebox plus, does it still exist?
Nuuk;320638 Wrote: Try here http://www.at-view.co.uk/at-tunes.htm. Thanks a lot! -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=49942 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] First shot at using Inguz
inguz;230255 Wrote: Sounds like a great question :) So I ran a little experiment. I set CrazyMicCal.txt to this (plus some intermediate points): 100.00 -20 110.00 0 5010.00 0 5020.00 -20 and the result below (octave smoothed): green is the Measured_Impulse_Response, purple is Normal_TestConvolution. This is actually the opposite of what I'd expected; I thought the mic calibration was the measured response of the microphone, but instead it's the inverse (i.e. the mic response is not 20dB down at 5020Hz, it's 20dB *up*). DRC is calculating the INVERSE response of the room. Therefore the effect of the mic cal file is the opposite of what you would expect. -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=35615 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] First shot at using Inguz
inguz;230275 Wrote: Well, there's no way to get a really true reading with an uncalibrated microphone. And I don't have a calibrated mic. So that's my next step... I got mine calibrated a while ago and my advice would be: It should be the first step! :P -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=35615 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Monarchy DIP
I just received my DIP Classic a few days ago, its between SB3 and Apogee Mini Dac now and makes a clear improvent. The digital edges around voices are gone now :-) -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=23977 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] First shot at using Inguz
muski;227044 Wrote: Thanks, Inguz. I'll have a look at the Octave scripts in the meantime... The octave scripts will give you this: http://www.ronaldverlaan.com/drc/left/drc-graphs.html http://www.ronaldverlaan.com/drc/right/drc-graphs.html Certainly worth creating them! :-) Don't forget to insert some silence before the impulse response created from ImpulePrep.exe, the octave scripts expects to have at least 512 samples (if I recall correctly) before the impulse center. -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=35615 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] DRC/Inguz and Microphone Calibration
muski;222838 Wrote: OK, I took the US-122L apart, and, from wikipedia, figured out what an oscillator looks like (hey, I'm a software guy...). I think I have found three oscillators. Here are the labels on them: 22.5792i6 (label on circuit board reads X1 22.579MHz) 245KD6H (labeled X2 24.576MHz) 160KD6H (labeled X4 16MHz) Based on this, can you tell whether it is doing native 44.1KHz recording, or do you think it is doing some kind of sample conversion that might be introducing artifacts? Do you think the first two oscillators might have something to do with USB or MIDI or something? Let's hope I can get it back together... muski Normally the value of the oscillators multiplied by an integer will give the natively supported sample rates. At firts glance you seems to be fine as it has 3 oscillators so it can support several sample rates without resampling. However I am a bit puzzled by the fact that 2x 22.5792 = 45.1584 and not 44.1 :P -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=36716 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] DRC/Inguz and Microphone Calibration
Toby Dickenson;222851 Wrote: muski wrote: OK, I took the US-122L apart, and, from wikipedia, figured out what an oscillator looks like (hey, I'm a software guy...). Congratulations. Its all the same really, just a different interface. I think I have found three oscillators. Here are the labels on them: 22.5792i6 (label on circuit board reads X1 22.579MHz) 245KD6H (labeled X2 24.576MHz) 160KD6H (labeled X4 16MHz) Based on this, can you tell whether it is doing native 44.1KHz recording, Yes. 24.576:22.579 is in the right ratio for switching 48:44.1. The 16MHz is for USB. - Toby (hardware/software guy) Hi Toby, The ratio might be correct, but the absolute frequencies are weird aren't they? Ronald. -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=36716 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] DRC/Inguz and Microphone Calibration
Toby Dickenson;222871 Wrote: tingtong5 wrote: 245KD6H (labeled X2 24.576MHz) The ratio might be correct, but the absolute frequencies are weird aren't they? 24.576MHz = 512 * 48kHz How stupid I am : Mhz and kHz , not the same thing :-X Say no more :( ;-) -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=36716 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] DRC/Inguz and Microphone Calibration
Phil Leigh;221572 Wrote: Fascinating... What soundcard is it? - Must make a note to avoid at all costs! Creative labs soundblaster live usb. As the DRC manual already warns: Most cheap game oriented soundcards often include a sample rate converter in their design, so that input streams running at different sample rates can be played together by resampling them at the maximum sample rate supported by the soundcard DAC. Usually this is 48 KHz as defined by the AC97 standard. These sample rate converters often are of abysmal quality, causing all sort of aliasing artifacts. Most deconvolution based impulse response measurement methods, including the log sweep method, are quite robust and noise insensitive, but cause all sorts of artifacts when non harmonic, but still signal related, distortion is introduced, even at quite low levels. The aliasing artifacts introduced by low quality sample rate converters are exactly of this kind and are one of the most common cause of poor quality impulse response measurements and consequently of correction artifacts. -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=36716 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] DRC/Inguz and Microphone Calibration
muski;221813 Wrote: Very interesting, indeed. I wonder if the Tascam US-122L USB audio interface suffers from the same resampling problem. It is more of a mid-range product, but who knows if/how it resamples (it supports 44.1, 48 96KHz sample rates) . Is there anyway to detect if there are resampling artifacts in the sweep recordings? (Tingtong -- I was reassured by your mic calibration plot -- roughly similar to mine.) Simply open it and see how many oscillators are in there and what frequency is printed on them! Yes they look quite similar :-) -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=36716 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] DRC/Inguz and Microphone Calibration
Yesterday evening I took new measurements, this time at a 48 kHz samplerate. Then I resampled to 44.1 kHz using Adobe Audition in highest quality setting. Surprise, surprise the earlier perceived brightness was gone and it seems to sound just right now using my mic calibration file :-) I did not expect this to happen but it really is true, preventing the soundcard from doing the resampling and doing it in software afterwards makes a significant audible difference in the end result! Maybe what I heard before as perceived brightness was just drc artifacts caused by an improper input (impulse response).. -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=36716 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] DRC/Inguz and Microphone Calibration
muski;221338 Wrote: Tingtong -- Where did you get your mic calibrated? muski In germany (I live in holland): http://lasip.hifi-selbstbau.de/cgi-bin/shop/shop.cgi?shop=product=Kalibrierungcart_id=2692111.29825 -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=36716 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] DRC/Inguz and Microphone Calibration
I did got some answers lately: - the calibration file I got equals the frequency response of my microphone - DRC also needs a microphone frequency response file In other words I could use my calibration file directly with DRC :-) So I did new measurements and created new filters. The resulting sound is too bright and sounds a little thin. So now I am reviewing my measurement chain again, starting with my soundcard. I opened it and found out that it contains only one oscillator of 6 Mhz, meaning it samples at 48 KHz and then resamples to 44.1 KHz (since I configured the card to measure at 44.1 kHz). This is not good (the resampling) so I am starting to look at buying another soundcard now :P Any hints for an USB or pcmcia card with a native 44.1 kHz oscillator would be welcome! -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=36716 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] DRC/Inguz and Microphone Calibration
Toby Dickenson;221436 Wrote: Ive just started trying drc too (family is out of the house all weekend - serious measurement begins tomorrow 8-). Sounds like big fun :-) Good luck and let us know how you went! Toby Dickenson;221436 Wrote: You may get some insight from graphing the frequency response of your measured impulse, and checking that it seems consistent with what you hear in your uncorrected system. You can do that using http://www.hometheatershack.com/roomeq/. That tool doesnt like the floating point wav format produced by the Inguz tools - I convert files using sox AnyInguzFile.wav -s2 Output.wav Wow a very new version of TMREQ :-) I immediately upgraded my old version, thanks for the hint! :) Also thanks for the hint of looking at the f-response of the impulse file. My installed sox version does not seem to support the -s switch, well guess I will have to read the manual ;-) -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=36716 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] DRC/Inguz and Microphone Calibration
Phil Leigh;221486 Wrote: The too bright sound won't be an issue with your current soundcard - the fact that it is resampling 48-44.1 won't make that much difference in this context. I agree, but it could be caused by a non lineair f-response of my cheap soundcard, so buying a better card might still be a good idea.. Phil Leigh;221486 Wrote: You may want to aim for a curve that rolls off gently above 15kHz or so - most long-term users of DRC prefer a gently rolled-off top end response to a flat one... I know, I was already using a curve that rolls off 8 dB at 20 kHz :P Still too bright.. Phil Leigh;221486 Wrote: Alternatively, if possible tell the DRC to ignore high frequencies. I don't know if the Inguz s/w supports this? I already asked and Inguz said his convolver does not support this. Instead he has the flatness control option, but that also destroys my well-corrected low-frequency response.. Life ain't easy ;-) -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=36716 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] DRC/Inguz and Microphone Calibration
Phil Leigh;221514 Wrote: My point was that the response (which is nothing to do with whether or not the card is re-sampling) will be flat enough for DRC purposes - you can't hear freq response variations +/- 0.5dB anyway. You need to roll-off way earlier than that. Cymbals are in the 9-14kHz range... Nothing much else is happening up there. Guitars are gone by 6KHz (at best). Sorry for the confusion. I ment that I am using a rollof (beginning at 400 Hz) that eventually reaches -8 dB at 20 kHz.. I fully agree with what you are saying ! -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=36716 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] DRC/Inguz and Microphone Calibration
I had my ecm8000 mic calibrated as well :-) I made a plot of the calibration values compared to the ones that come with the drc distribution (ecm8000.txt). When using this calibration file with drc the sound becomes way too bright. So I reversed all the values (plus - minus and vice versa) but then the sound became too dull (lack of high frequencies). So I am trying to figure out now how to interpret my calibration file and how drc does interperet those values. +---+ |Filename: mic-cal.jpg | |Download: http://forums.slimdevices.com/attachment.php?attachmentid=3142| +---+ -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=36716 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Tentlabs clock inside SB3
Unfortunatly I can't because I do not have the means to measure jitter. The improvement I notice is therefore purely subjective :P What I can do is to compare it in an AB test to an unmodified SB3 but then I have to invite someone over sometime that has one :P -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=37530 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Tentlabs clock inside SB3
harmonic;220333 Wrote: Tingtong duck for cover or run Why is that? :P -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=37530 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Tentlabs clock inside SB3
harmonic;220351 Wrote: You are not doing enything wrong at all, but none measurble mods= flame war At least I am not claiming anything, except for the fact that I think that this is subjectively an improvement :P -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=37530 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Tentlabs clock inside SB3
Pat Farrell;220399 Wrote: Subjective improvements are real, but why do you attribute it to jitter? I think it is the other way around :P Replacing the crystal by a low jitter XO module will just do that, lowering jitter (or not if it is not implemented correctly..). If I hear an improvement after that mod it must be from lowered jitter or it might be a placebo effect. I think it is the first, but I just can't prove it ;-) Ronald -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=37530 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Tentlabs clock inside SB3
Pat Farrell;220414 Wrote: I seriously doubt that jitter is a real problem, and more so don't believe that simple fixes for it are real. I could be wrong, YMMV, etc. Just listen to a cd player with a low-jitter clock and you will hear that jitter absolutely is an audible problem. However lowering jitter in the SB3 might be hard because of the not so good power supply (not talking about the external supply) design and the fact that different signals are sent through inverters that are physically in the same integrated circuit housing, thus polluting each other. I was pretty sure I heard an improvent right after I did this mod, but I do realize that I might just hear what I expected to happen.. (placebo). Unfortunatly it aint so easy to switch back and forward in this case. I will try however to compare it to an unmodified SB3. I did this before when I build an external low jitter clock, in that case it turned out that the unmodded SB3 sounder better :P I think this mod hs a higher chance of sounding better :P We'll see.. -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=37530 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Tentlabs clock inside SB3
ezkcdude;220422 Wrote: Be honest. Have you personally *ever* auditioned a cd player before and after a low-jitter clock was put in place? And if so, was jitter measured? And if so, did it sound better? Unless you did those three things, please don't claim *I heard lower jitter*. Yes I did! But we did not measure.. However for me the effect was significant and beyond any doubt a big improvement. By the way I think the SB3 is great, my remarks in my previous post were with high-end results in mind, which of course cannot be expected of a device in this price category. -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=37530 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Tentlabs clock inside SB3
Today I built-in a Tentlabs XO in my SB3 with an external powersupply for this XO. This is a clear improvement in sound, the sound is now closer to a hig-end cd player, in other words, jitter indeed seems to be significantly less! +---+ |Filename: DSC02729.jpg | |Download: http://forums.slimdevices.com/attachment.php?attachmentid=3135| +---+ -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=37530 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] DRC/Inguz and Microphone Calibration
That's why I choose to use a flat curve correction file for now instead of the drc correction curve. Guess its time to have my mic calibrated :) -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=36716 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] DRC/Inguz and Microphone Calibration
The amount of deviation from the ecm8000 response claimed by Behringer is so high that if this is really true this means this mic is totally useless without calibration. Another conclusion would be the using the drc ecm8000.txt is useless as well.. Actually proper room correction would not be possible with this mic (without calibration). I'm not saying that it is not true what you are telling here, but I do find this whole thing very very weird.. Apart from this calibration story, I was already asking myself if using ecm8000.txt from drc is a good idea or not.. I suppose someone measured one ecm8000 mic which does not mean is it valid for all of them.. -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=36716 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] DRC/Inguz and Microphone Calibration
Maybe a little off-topic but I measured the frequency response (from 10-20KHz) of my two mic pre-amps: - Behringer Tube Ultra Gain Mic 100 - Behringer UB802 +---+ |Filename: mic100-vs-ub802.jpg | |Download: http://forums.slimdevices.com/attachment.php?attachmentid=3062| +---+ -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=36716 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Audiophile wanna-be
PhilNYC;215410 Wrote: The Complete Guide To High End Audio by Robert Harley is considered by many to be the best book on high end audio http://www.amazon.com/Complete-Guide-High-End-Audio/dp/0964084953/ref=sr_1_1/104-7016275-9578350?ie=UTF8s=booksqid=1184763958sr=1-1 I can recommend it as well (got a copy myself). -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=36907 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] First shot at using Inguz
After buying a decent sound card I get good measurements now and am enjoying a proper working room correction now, which really is a huge improvement over non-corrected sound :- I am a happy guy :) -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=35615 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Bolder modded SB3 sounds too digital
Marley3;206373 Wrote: There must be something I'm missing... Jitter.. As said before, it depends highly on your dac wheter you will here these differencs or not. -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=35803 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Inguz Audio tips and initial impressions
I would like to share my initial impressions as well. But first of all I would like to thank Inguz for this amazing piece of work! :-) When using normal.drc from Inguz and flat.txt as a target curve, room correction sounds very very bright (way too much treble so to speak) Then I tried normal.drc but bk-3-spline instead, still way way too bright sound. Even when configuring flatness to 3 instead of 10. When using soft.drc and bk-3-spline and flatness at 3 again things start to sound better but still a bit bright :P Apart from my issues with this weird frequency behaviour I certainly hear the great great potential of this room correction system! Actually after listening to this corrected sound I found it hard to turn back to the uncorrected sound. I'm wondering why the corrected sound has soo much treble. For now I guess I will blame my measurements. I do use a behringer ecm8000 microphone together with the behringer tube mic amplifier and a cheap usb soundcard. I guess I might have to replace the soundcard to start with. Regards, Ronald -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=29489 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] First shot at using Inguz
inguz;205316 Wrote: tingtong5: yes, this looks absolutely normal. The best startingpoint for a target file is usually the bk-5-spline rather than flat, but anyway try listening with flatness values around 3 to 5, see if this brings back some of the frequency balance you're used to. Thanks for the info Inguz! I did not see bk-5-spline in the sample folder of DRC though ? Ronald. -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=35615 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] First shot at using Inguz
inguz;205330 Wrote: Re: REQW: if you didn't get prompted for The flatness control works roughly like this: So If I understand correctly the flatness control does effect the frequency response but does not affect the other room corrections like echo or phase corrections? Ronald. -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=35615 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Inguz Audio tips and initial impressions
Hi Guys, I tried to create filters today but no luck :P Compiling drc was no problem but when executing ImpulsePrep nothing happens, no error, no messages, no progress, just nothing.. hammie:/home/ronald# ImpulsePrep.exe /L left.wav /R right.wav /copy ImpulsePrep v0.9.22 http://inguzaudio.com/Tools/ImpulsePrep/ This evaluation version will expire 11/1/2007 12:00:00 AM Processing left measurement (left.wav)... Thats all, no output anymore afther that :P When I execute ImpulsePrep on windows it does do something but then I have no DRC :P -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=29489 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] First shot at using Inguz
I did my first measurement today using an ECM8000 microphone. The resulting room correction sounds very thin and bright. I wondered if this has anything to do with the way the measurements look. Is this kind of graph normal? +---+ |Filename: measurement.jpg | |Download: http://forums.slimdevices.com/attachment.php?attachmentid=2879| +---+ -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=35615 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] First shot at using Inguz
tonyptony;205191 Wrote: tingtong, I don't know, but your result sounds similar to mine. Which correction curve did you select? I'm assuming you edited the drc files to insert the right mic calibration file and pick the target curve you wanted to use. Hi Tony, I used the normal.dot from Inguz. I used the ecm8000 correction file and the flat.txt as target response. What do you guys use as mic pre-amp ? Best regards, Ronald -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=35615 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Anybody Hacked SB3 External Clock?
After some serieus listening and comparing to my cd transport I do not hear much of a difference anymore while before the difference was quite clear. So adding the external clock + reclocker seems to be a major improvement :-) It would be nice though to compare it to a non-modified SB3.. Hopefully I can get my hands on one to make the comparison :P -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=32761 ___ audiophiles mailing list [EMAIL PROTECTED] http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Anybody Hacked SB3 External Clock?
Jitterbug;193678 Wrote: -I bypass the HCU04 and go directly to pin 42 on the XILINK. I dare not to solder directly to the xilink :( Jitterbug;193678 Wrote: -Rather than using a 50R/25R voltage divider to get from the X03's 5V to the needed 3.3V, I use a 100R resisitor from the clock signal to ground on the SB2 end. BTW, for this to work you need to keep the resistor leads very short. I also used 100R parallel in order to get 3,3V, but kept the resistor on the XO3 side. Any advantages on moving it to the other side of the coax? Jitterbug;193678 Wrote: -I also take the SPDIF dirctly from the XILINK, so have take the hex buffer completely out of the circuit - in fact right off the board. } Again, I dare not do this, afraid to screw my sb3 up for good :( I also wonder though what the advantage is? [QUOTE=Jitterbug;193678 Next step is to slave the the X03 clock to XO-DAC clock on my DAC for synchronous reclocking. I house everything in one enclosure so am excited about what this csn produce in terms of jitter levels. Yep, my next step as well :P Please, keep us informed, very interesting. To be honest I do not hear much of an improvement yet... :P -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=32761 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Anybody Hacked SB3 External Clock?
Mark Lanctot;193293 Wrote: The WAF must be through the roof on that mod! :-) Did something about that today. The new box also contains the 5V regulated power supply. +---+ |Filename: DSC02566.jpg | |Download: http://forums.slimdevices.com/attachment.php?attachmentid=2667| +---+ -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=32761 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Anybody Hacked SB3 External Clock?
My SB3 is running now on an external clock. Also the spdif output is relocked now before send to the DAC. +---+ |Filename: DSC02562.jpg | |Download: http://forums.slimdevices.com/attachment.php?attachmentid=2660| +---+ -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=32761 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Anybody Hacked SB3 External Clock?
RioTubes;190474 Wrote: Ronald, the pic is to small to tell if you connected the clock input cable's ground to a handy clock reference point on the SB3 board? Well that might have been my big mistake.. I used a wire to connect ground from one of the rca output ground to the other end of the coax cable's shield. I suppose this is a big sin since we are talking high frequencies here .. -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=32761 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Anybody Hacked SB3 External Clock?
seanadams;190475 Wrote: Where exactly? I see only heat shrink tubing around the sleeve of that coax where it connects to the pcb. Have you got a scope? The shrink tubing is there to isolate the shield from the SB3's smd component. I connected a ground wire to the other end of the coax which I think was a mistake.. Yes I do have a scope, though it is a 10 MHz one.. The clock looks more like a sine wave then a square wave but I assumed this is because of the scope's limits in being able to display frequencies 10 MHz.. -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=32761 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Anybody Hacked SB3 External Clock?
So I guess I need to try again and do it the right way this time :P Now I have to find a good ground reference point on the circuit board somewhere near the pad which serves as the external clock input.. -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=32761 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Anybody Hacked SB3 External Clock?
AndyC_772;190497 Wrote: One of us is missing something here... you need to connect the screen of the coax cable to ground at BOTH ends. edit: I see you noticed that 2 minutes ago... ;) Yes I am aware of this now :P The ground of the external clockboard was connected to the ground of the SB3, but not in the proper way.. -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=32761 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Anybody Hacked SB3 External Clock?
Last weekend I removed the 11,28 MHz crystal from the SB3 and tried an external Tentlabs clock (same frequency of couse and a level of 3,3V). By the way the blue coax is the spdif output, the black one is for external clock input. (the next step would be to slave the SB3 to the master clock in my Monica DAC, but first step was to test whether an external clock would work well or not..). And now the bad news, it didn't work Angry The time counter (now playing screen of the squeezebox) started running when connecting the external clock but Monica did not had a lock. Then I tried to solder this external clock (only 3 cm of coax) directly to the SB3 board. Same story... But... When I accidently touched the ground of the external clock board that I build it suddenly did work! When I removed my finger again the DAC stayed locked for a few seconds and then lost lock again. I now have to find out why this happens. Any ideas? I must add, that I did NOT remove the 2 caps connected to the crystal pads. The reason I did not do this was simply that I would render the SB3 unusable if the external clock wouldn't work. For now I placed back a 11,28 MHz crystal and the SB3 is playing again. +---+ |Filename: DSC02547.jpg | |Download: http://forums.slimdevices.com/attachment.php?attachmentid=2596| +---+ -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=32761 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Anybody Hacked SB3 External Clock?
Patrick Dixon;190250 Wrote: I can't quite see from you photos, but you do have a ground reference between the SB3 and the tent clock board, don't you? Yes I do... :P -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=32761 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Anybody Hacked SB3 External Clock?
miklorsmith;189780 Wrote: You can add a wordclock in to the SB3, but this is strictly a custom operation for a modder. The clock chip in the SB is deactivated and hardwired with a dedicated clock cable. I suppose you mean a BIT clock? 11,28 MHz is a bit clock not a word clock :P -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=32761 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Anybody Hacked SB3 External Clock?
Hi :-) I'm about trying the same thing. That is keeping the spdif but slaving the SB3's clock to my DAC. I already changed the spdif RCA connector for a BNC connector and bypassed the inductors. I would also like to take the spdif signal directly from the 74HCU04 since my DAC's spdif receiver can handle +/- 12V and would most certainly perform better when getting a signal higher then the standard 0,5V. However the impedance should still be 75 Ohm of course and my question is how to obtain that goal since there is no information about output impedance in the 74HCU04 datasheet :-( The DAC I use is self-made but based on the Monica 2 DAC from diyparadise. I will change its XO module from 80 MHz to a 11,28 MHz tentlabs XO and I will use this clock as the bitclock for the TDA1545 DAC chip (ignoring the reclocked spdif clock). This clock will be fed to the SB3 as well. By doing this the asynchronous reclocking (of data and wordclock) would then automatically become synchronous reclocking. I would have to attenuate the clock signal that goes to the SB3, since the tentlabs XO has a 5V output. I will use resistors for this. Regards, Ronald -- tingtong5 tingtong5's Profile: http://forums.slimdevices.com/member.php?userid=9671 View this thread: http://forums.slimdevices.com/showthread.php?t=32761 ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
