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!
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occam
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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
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sbjaerum
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sbjaerum Wrote:
Is there a bug registered for this feature?
Steinar
Yes, we are going to add it along with #1397
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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
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
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
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
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!!
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
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
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
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.
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seanadams
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
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
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
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
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
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
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
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!!
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cbemoore
___
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.
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If a man
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 -
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
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
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
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
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. :-)
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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
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
Qustion: _Why_ is the SB2 output level so high?
--
JJZolx
Jim
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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
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,
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
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
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:
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