[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
Just a quick comment to say how impressed I am with the speed and sophistication that you've brought to bear in making the variable outputs flexible and resolving. Kudos! -- occam ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
seanadams Wrote: The feature is not in yet, but I did get as far as testing the disabling of the DAC to confirm that this will probably work for your situation Is there a bug registered for this feature? Steinar -- sbjaerum ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
sbjaerum Wrote: Is there a bug registered for this feature? Steinar Yes, we are going to add it along with #1397 -- seanadams ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
Just wanted to thank the Slim guys for implementing this so fast. I'm no techie, but am now feeding my Sunfire Cinema Grand amp directly from SB2 analog outs, and my system has NEVER sounded so pure. With this setup, the native SB2 DAC sounds fantastic. Can't even imagine going with an outboard DAC. Whatever future volume/output voltage tweaks are implemented will be icing on the cake! -- sleepysurf aerius i, nht sub two, yamaha rx-v1000 (pre/pro), sunfire cinema grand 200 ~five (vertically bi-amped), squeezebox2 (streaming cd-quality audio), 300gb buffalo linkstation (remote flac audio file storage), blue jeans cables. 'Click to see pix of my system' (http://www.martinloganowners.com/~tdacquis/forum/showthread.php?t=732) ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
On Wed, 2005-09-21 at 04:10 -0700, hansg wrote: Is it possile to do this for the slimp3-players? Or do I have a great excuse to buy two more squeezebox2? I don't know officially, but I've only seen comments that it might be possible on SB1s, nothing about Slimp3s. Seems like a great excuse to buy some Squeezeboxen. -- Pat Farrell http://www.pfarrell.com ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
Any suggestions as I have very little idea how to optimally set this new function. I have nuforce amps and the specs say: max input voltage=1.2V, Gain=26db, Input Impedance: 47K ohm, SNR = 120 db at 100W. Any help would be appreciated. Right now without applying the updated firmware and slimserver update, volume 1 is low, 2 is normal, 3 is loud and everything from 4-40 is way too loud. -- rme ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
rme Wrote: Any suggestions as I have very little idea how to optimally set this new function. I have nuforce amps and the specs say: max input voltage=1.2V, Gain=26db, Input Impedance: 47K ohm, SNR = 120 db at 100W. Any help would be appreciated. Right now without applying the updated firmware and slimserver update, volume 1 is low, 2 is normal, 3 is loud and everything from 4-40 is way too loud. The optimum depends on a) your listening preference b) amp gain and c) speaker sensitivity. i.e. experiment and then pick the value that gives you the preferred listenable range within the main volume control. The latest nightly releases have this feature: http://www.slimdevices.com/downloads/nightly/latest/6.2/ Just grab the right one (exe for Windows, dmg for Mac, etc) and give it a try. Also note Vidur has recently made some improvements to the main volume control (higher resolution and replaygain support) and we are working to address issues with the volume curve, so things may change a little going forward. -- seanadams ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
Well the latest volume control settings have made a BIG improvement in low-volume resolution. I've now set the SB2 preamp control to 15dB attentuation (along with 10dB at my power amp) and there's plenty of adjustment at low volumes. This also means that my maximum volume is now 15dB louder!! Which is nice... :-) cbemoore Wrote: Hi Sean, Just downloaded the latest firmware, and it works perfectly. Thanks! (BTW, I've set the SB2 preamp control to 30dB attenuation, *and* my power amp to 10dB attenuation, and the volume is just about perfect! I must have a particularly loud amp!!!) Chris -- cbemoore ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
Just to clarify any potential misunderstanding: My maximum volume has only increased by 15dB because I've decreased my SB2 preamp attenuation setting from 30dB to 15dB. I wouldn't want anyone to think that the new volume control changes will magically increase the SB2 maximum volume! It simply provides better volume resolution at low volumes. Chris -- cbemoore ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
Still on the subject of dBu. My power amp has a power-save function. If the input signal is less that -74dBu, the power amp will automatically switch off after 5 mins. If it detects a signal louder than -74dBu, it will automatically turn back on. My problem is that when I connect the SB2 directly to the power amp, the power amp never turns off. This would seem to indicate that even when the SB2 is turned off, its noise floor is louder than -74dBu. Is this to be expected, or do I have a duff unit? Cheers Chris -- cbemoore ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
cbemoore wrote: Still on the subject of dBu. My power amp has a power-save function. If the input signal is less that -74dBu, the power amp will automatically switch off after 5 mins. If it detects a signal louder than -74dBu, it will automatically turn back on. My problem is that when I connect the SB2 directly to the power amp, the power amp never turns off. This would seem to indicate that even when the SB2 is turned off, its noise floor is louder than -74dBu. Is this to be expected, or do I have a duff unit? Sean can probably answer this better but 74dBu is approx. 150uV rms, i.e. not much so it's possible that there may be some residual noise that is keeping your amp switched on. R. -- http://robinbowes.com If a man speaks in a forest, and his wife's not there, is he still wrong? ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
That is a really low threshold. I'd have to measure what the noise floor is in absolute terms - I've only looked at it in the frequency domain which isn't going to indicate an exact pk-pk figure needed to determine if it's always below 150uV. -- seanadams ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
seanadams wrote: Hmmm looks like using 128x (instead of 64x) oversampling brings the out-of-band noise way down, mostly under -115dBu all the way up to 96KHz. wonder what are the pros/cons of using 128x all the time. the noise is low level and out of band, but could be interacting with signal, no? is the level still that much lower when processing signal? --rt ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
fuzzyT Wrote: seanadams wrote: Hmmm looks like using 128x (instead of 64x) oversampling brings the out-of-band noise way down, mostly under -115dBu all the way up to 96KHz. wonder what are the pros/cons of using 128x all the time. the noise is low level and out of band, but could be interacting with signal, no? is the level still that much lower when processing signal? --rt well it does have a marginally higher noise level in the audio band. here they are overlaid: http://www.seanadams.com/64_128.gif These jive with the data sheet (page 28) - note that their scale goes all the way to 8 times fs and mine only goes to 2x. -- seanadams ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
Re: [SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
seanadams wrote: well it does have a marginally higher noise level in the audio band. here they are overlaid: promising. for the few db in the audio band and for the potential harmonic interactions of the slightly higher band stuff. hard to say what the ears will make of it, but we'd sure love to find out. --rt ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
rme Wrote: Does this change for volume control degrade the quality of the stream? I saw a prior thread on analog volume reductions dropping bits. This sounds like it is changing voltage instead so I have no idea of whether it's changing the data or is truely like a preamp volume control. Thanks for any insight into this. I don't know how the volume control is implemented in the DAC except that it is a digital function. Here's the data sheet: http://www-s.ti.com/sc/ds/pcm1748.pdf -- seanadams ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
It works lovely, thanks everso for getting this extra enhancement up and running. Started with attenuation of 30 just to be extra safe (knowing it should be 8.75 for my particular power amp-0.8V-thanks very much to Robin for explaining), then 20 and I'm on 10 at the mo and do not think I need to go to the 8.75. Next is to get a decent interconnect to tighten up the bass a bit more and smooth the voices. Thanks again for this enhancement. -- Deaf Cat ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
Cheers Robin for the simple explanations for a simple brain. Getting the hang of this attenuation business now...!? Actually changed attenuation to 12, as vol no.20 was rather loud and as the bass is a tad flabby at the mo did not want to push it any more - will wait till I get a better analogue cable. : Well, I expect the UI to change - this is something Sean has knocked out quick and there is almost certainly a better way to specify the attenuation. I'm sure he'll come up with something better. Any suggestions?[/color] -- Deaf Cat ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
usualsuspects Wrote: Great! In further reading of my amp manual it says (re the gain pots) Your amplifier sounds best with these level controls set to maximum So it looks like I can turn them all the way up and set attenuation on the SB2 to match the correct level for my amp. Earlier in this thread you stated: However when you reduce the signal level, the noise floor doesn't change so your SNR becomes effectively worse So from a best sound standpoint would I be better off using the new built in attenuation or using an external attenuator? Give it a try - if you don't hear any hiss/hum when the system is inactive, it should be fine. Personally I would prefer limiting the amp, for safety reasons if nothing else. -- seanadams ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
seanadams Wrote: OK I added this. The setting goes from 0 to 63 db of attenuation in 0.5db steps. Firmware will be updated soon - need to sync up with Vidur on that first. Wow - didn't expect it to be *that* quick! Thanks Sean!! -- cbemoore ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
seanadams wrote: OK I added this. The setting goes from 0 to 63 db of attenuation in 0.5db steps. Firmware will be updated soon - need to sync up with Vidur on that first. Just to add... I reckon 2.5dB of attenutation will bring the level down to 0dBu. R. -- http://robinbowes.com If a man speaks in a forest, and his wife's not there, is he still wrong? ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
Robin Bowes Wrote: I'm not sure that the way of setting the attenutation is the most intuitive of user interfaces, but it does the job. I just put something simple in there to make it work... open to better ideas. Dean, Vidur and I have been talking about volume control in general - there's a lot more to it than meets the eye, once you consider crossfading, replaygain, headphone use, amp use, etc. Right now the sofware volume control uses an 8-bit linear value which by itself doesn't give enough levels on the low end of the scale. With this additional preamp control (7 bits of half decibels, done in the DAC) it should solve the problem for those who've been stuck on the low end of the bar with not enough resolution. But yes, the UI is a bit abstruse. How about just a pop-up list with quiet, not so quiet, loud, eleven? :) -- seanadams ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
seanadams Wrote: I just put something simple in there to make it work... open to better ideas. Dean, Vidur and I have been talking about volume control in general - there's a lot more to it than meets the eye, once you consider crossfading, replaygain, headphone use, amp use, etc. Right now the sofware volume control uses an 8-bit linear value which by itself doesn't give enough levels on the low end of the scale. With this additional preamp control (7 bits of half decibels, done in the DAC) it should solve the problem for those who've been stuck on the low end of the bar with not enough resolution. But yes, the UI is a bit abstruse. How about just a pop-up list with quiet, not so quiet, loud, eleven? :) If you want to make use of all 128 steps in the digital control then a more intuitive interface might be to simply enter an integer from 1 to 128 (maximum) (or perhaps 0 to 127) and explain that at the maximum setting the signal is unaltered and that each step below the max gives 0.5db of attenuation. If the DAC offers 128 discrete steps of volume control, have you considered the possibility (maybe as an option) of reversing the roles of the software volume control and the DAC's digital volume control so that we'd have the option of controlling volume in the digital domain? -- JJZolx Jim ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
JJZolx Wrote: If the DAC offers 128 discrete steps of volume control, have you considered the possibility (maybe as an option) of reversing the roles of the software volume control and the DAC's digital volume control so that we'd have the option of controlling volume in the digital domain? Eh? They're both digital - just one's done in the CPU and one's done in the DAC. -- seanadams ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
Cheers for the explanations, All Clear, except, hope you don't mind another (maybe daft) question: Not quite. dB (decibels) are a logrithmic measurement, usually referenced to some standard value. dBu are referenced to 0.7746v. For the stock SB2, output is 2.12v(rms). In dBu, this is: 20 x log10(2.12 / 0.7746) = 8.75dBu Say you want to reduce your output to 0dBu, you need to add 8.75dBu of attenuation. This would reduce the max Vout(rms) to 0.7746v. So, take 8.75dBu off of 2.12V to end up with 0.7746V (Which is what my power amp would like-roughly 0.8V-cool) So, if we add 8.75dBu attenuation (it would be safest to round it to 9dBu I suppose) into the Option Box in the Audio settings for the SB2 we should be fine. But how does the 8.75dBu relate to the 0.0 - 63.0dB scale? Oh Boy! Takes alot of brain power to almost understand that taking off is addin on and 0 is 0.7, quite intresting how logs relate though. I hope the above helps. Absolutly! BTW, the firmware has just been relased. I've downloaded it and can report that it's working well. Is this in the 6.2, 2005-09-09 download? I'm not sure that the way of setting the attenutation is the most intuitive of user interfaces, but it does the job. Your telling me!! Who would have thought it a! Buy a bit of audio equipment and then starting to want to know about Logarithms!! Thanks again for the explanations. How about just a pop-up list with quiet, not so quiet, loud, eleven? :) eleven - FAB. -- Deaf Cat ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
Does this change for volume control degrade the quality of the stream? I saw a prior thread on analog volume reductions dropping bits. This sounds like it is changing voltage instead so I have no idea of whether it's changing the data or is truely like a preamp volume control. Thanks for any insight into this. -- rme ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
Deaf Cat Wrote: eleven - FAB! Have you noticed how the player volume in the web interface goes up to 11? That's not a mistake. :-) -- cbemoore ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
Hi Sean, Just downloaded the latest firmware, and it works perfectly. Thanks! (BTW, I've set the SB2 preamp control to 30dB attenuation, *and* my power amp to 10dB attenuation, and the volume is just about perfect! I must have a very loud amp!!!) Chris -- cbemoore ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
I still think Sean's solution (option 2 in bug 1601) is the best solution. When I hook my SB2 direct to my power amp, volume 1/40 is fairly loud. Volume 2/40 is very loud. Volume 3/40 is too loud! And there's no way I can make it quiet enough for background music. The best solution would be to add a a per-player option to attenuate the signal. That way, its up to the user whether they want to select the option or not. And since the DAC has an inbuilt attenuation capability (which can be controlled by the firmware), I'm guessing this would be the obvious place to perform the attenuation. So if you're having problems with the analog output being too loud, make sure you vote for bug 1640!! Chris -- cbemoore ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
Qustion: _Why_ is the SB2 output level so high? -- JJZolx Jim ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
seanadams said the following on 09/09/2005 00:06: Qustion: _Why_ is the SB2 output level so high? Squeezebox1 was 3vpp and people complained it was too low. Are you sure? 3vpp is 1.06v rms and I'm pretty sure my SB1 has an output that is less that 0dBu (which would be 0.7746v rms). Now it's 6vpp (~2v rms) which is in line with nearly all high-end equipment. Higher voltage == better SNR along the whole path. This isn't an oops we made it too loud - SB2 was deliberately designed (at significant added component cost) to have 2vrms levels. This $20,000 cd player, for example, is 2vrms: http://www.stereotimes.com/trans120699.shtm I don't get what the problem is. If the output were hot enough to clip anyone's receiver that would be an issue, but it's not - the only thing this would potentially clip is really cheap amplified speakers - even a $100 receiver will handle 2vrms. If you're going directly into a standalone DAC... well, the only reason you cat do that at all is because we have a volume control. Of course at full volume you're going to drive it to the max - the same would happen with a CD player. The problem is that most domestic equipment is designed to operate at 0dBu, or 0.7746v rms for max level. Sure, the preamp can often handle more, but the gain stages are setup so the volume control operates sensibly with this level of input. When the input is hotter the useful range of the volume knob is reduced. The ideal solution is to a) add a preamp ...designed to operate with 2.12v input b) open up the amp and tune its input pots (asuuming it has them) c) add in-line attenuators as suggested above. ...with attenuation of approx. 2.58 dBu d) open up the Squeezebox and replace R37 R39 with 12.7k or 12.9k resistors. Here's my calculations: Standard Configuration R37 4700 R38 8250 Gain1.755319149 Standard Voltages Vout(p-p) 6 Vout(p) 3 Vout(rms) 2.121320344 Vin(rms)1.208509771 Desired Voltages Vout(rms) 0.7746 Gain0.640954685 Required R3712871.42475 Attenuation For 0dBu-2.585548412 The internal volume control is not ideal for this, but sure we can tweak the software to adjust the range and make it work. What effect would this have on audio quality? R. -- http://robinbowes.com If a man speaks in a forest, and his wife's not there, is he still wrong? ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
cbemoore Wrote: Since we're referring to the analog outputs, I assume you mean a standalone power amp, not a DAC? oops - edited If I connect the SB2 to a preamp and on to my power amp, the *only* thing the preamp does is control the volume. Since volume is already controlled in the SB2, it makes sense to remove the preamp completely, and connect the SB2 direct to the power amp. This makes the signal path much cleaner, and to my ears at least, it sounds much better. The thing is... it actually doesn't! The SB2 has a very low noise floor down around -120db. However when you reduce the signal level, the noise floor doesn't change so your SNR becomes effectively worse. Less signal, same noise == less SNR. That's why a fixed analog attenuator set your maximum listening range is the cleanest way to go - it attenuates the signal and the noise together, meaning that the noise floor in your amplifier is the limiting factor (which it might be anyway, in which case you're right and all this is moot). It also cuts down on the number of boxes, cables and power sockets in my system, which is always nice I agree. It is also easier to set up and doesn't require buying or soldering together an attenuator. -- seanadams ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
Robin Bowes Wrote: seanadams said the following on 09/09/2005 00:06: Qustion: _Why_ is the SB2 output level so high? Squeezebox1 was 3vpp and people complained it was too low. Are you sure? 3vpp is 1.06v rms and I'm pretty sure my SB1 has an output that is less that 0dBu (which would be 0.7746v rms). I'm rounding here... but yes I'm pretty sure I measured Squeezbox1 is in the 2.9-3v range. That's taking the outputs straight off the Micronas' built-in DAC. It can actually go almost to 3.3 (Vcc) but it starts to clip at some point and that's where I set the max. Sorry I don't have the exact figures handy. -- seanadams ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
cbemoore Wrote: Thanks for the explanation, Sean. That makes it much clearer. So do I need to go out and buy some attenuators, or is there a teensy weensy chance you might be implementing something in software??? Cheers Chris It's on the list. The list is long. I will move it up the list. :) -- seanadams ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
[SlimDevices: Audiophiles] Re: SB2: reduce analog out voltage by 10x?
Great! In further reading of my amp manual it says (re the gain pots) Your amplifier sounds best with these level controls set to maximum So it looks like I can turn them all the way up and set attenuation on the SB2 to match the correct level for my amp. Earlier in this thread you stated: However when you reduce the signal level, the noise floor doesn't change so your SNR becomes effectively worse So from a best sound standpoint would I be better off using the new built in attenuation or using an external attenuator? -- usualsuspects ___ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
