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Which sample rate should I use w/ Xonar STX? Better performance at 96?, [was “Which default sample rate for my sound card ?” in General Audio]
extrabigmehdi
post Jun 29 2012, 14:12
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Hello,
before I was doing in my dsp chain in foobar:
sox set to 96 khz , followed by a big vst chain of dsp tweaked to my taste.
But I've realized that overall my dsp were performing worse than with 44.1 khz.

So now it's more like :
big dsp chain followed by sox set to 96 khz.

Why upsampling ?
My reasoning:

- the default sample rate of xonar stx after install is 96 khz

- I imagine that if I use different software, with different sample rate, they must be mixed to a single sample rate at one moment.
So I rather set a big sample rate on soundcard, and play music at that sample rate.

- the measurements at tech report website, indicate that the xonar stx perform better at 96 khz , than 44.1 khz.
for 44.1 khz : http://techreport.com/articles.x/17256/8
for 96 khz: http://techreport.com/articles.x/17256/9

- if I don't upsample , and set the default sample rate to 96 khz, I imagine that the upsampling
would be either handled by the windows mixer or the driver of sound card ?
So I rather use something that is well tested like sox.
I'm not sure if wasapi would bypass resampling by system.

- I can hear differences, but if you ask me to verify such claim, I don't know how it could be ABX ed.

Here are sample rate supported by soundcard:
44.1 khz, 48 khz, 96 khz, 192 khz

So which sample rate would you use , and why ? Since even tech report website indicate that the xonar stx perform better at higher sampling rate, is is pertinent to upsample using sox "on the fly" while playing music , or should I leave this work to the driver/soundcard/ windows mixer/ I don't know .
Does wasapi allow to bypass upsampling if the the sample rate set on soundcard doesn't match sample rate of played music ?

thanks
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stephan_g
post Jul 2 2012, 17:03
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You should be getting better 16-bit results still when setting the headphone out to "600 ohm", though this may be pushing the abilities of the input stage. An adapter cable for a line-out to line-in connection may yield better results.

Your 16-bit results appear to be almost entirely noise limited. Otherwise it will seem that distortion gets a hint worse at 192 kHz, and 44.1 kHz shows the reduced dynamic range usually observed with these cards (I am guessing that the master clock is generated with a somewhat noisy CMOS PLL rather than devised by crystal clock division in this mode).
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extrabigmehdi
post Jul 2 2012, 18:22
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QUOTE (stephan_g @ Jul 2 2012, 16:03) *
You should be getting better 16-bit results still when setting the headphone out to "600 ohm", though this may be pushing the abilities of the input stage.



I've been told that changing the headphone impedance setting in the panel of xonar stx , does nothing special : it just define a new volume limit.
I've "optimally " set the volume by following the rma test indications (an indicator becomes red if volume is too low, and also if too high).

This post has been edited by extrabigmehdi: Jul 2 2012, 18:23
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Posts in this topic
- extrabigmehdi   Which sample rate should I use w/ Xonar STX? Better performance at 96?   Jun 29 2012, 14:12
- - extrabigmehdi   oops sorry if I didn't post on hardware secti...   Jun 29 2012, 14:14
- - uart   QUOTE (extrabigmehdi @ Jun 29 2012, 05:12...   Jun 29 2012, 15:23
- - uart   QUOTE (extrabigmehdi @ Jun 29 2012, 05:12...   Jun 29 2012, 15:35
- - lvqcl   QUOTE - the measurements at tech report website, i...   Jun 29 2012, 16:02
- - Ceniza   On my side I have a Xonar HDAV1.3 Deluxe connected...   Jun 29 2012, 19:43
- - extrabigmehdi   So, I finally did this famous RMAA Test for the f...   Jun 30 2012, 05:32
|- - uart   QUOTE (extrabigmehdi @ Jun 29 2012, 20:32...   Jun 30 2012, 09:28
|- - dhromed   QUOTE (extrabigmehdi @ Jun 30 2012, 06:32...   Aug 31 2012, 09:02
- - skamp   I'm not sure the "Stereo Mix" featur...   Jun 30 2012, 09:55
|- - uart   QUOTE (skamp @ Jun 30 2012, 00:55) I...   Jun 30 2012, 13:14
- - lvqcl   QUOTE while windows allows to set also another sam...   Jun 30 2012, 10:49
- - extrabigmehdi   Yeah I meant that the RMAA test was a bit unrelia...   Jun 30 2012, 13:22
|- - uart   QUOTE (extrabigmehdi @ Jun 30 2012, 04:22...   Jun 30 2012, 13:44
- - extrabigmehdi   Ok , I've redone the rmaa test with "line...   Jun 30 2012, 16:19
- - stephan_g   You should be getting better 16-bit results still ...   Jul 2 2012, 17:03
|- - extrabigmehdi   QUOTE (stephan_g @ Jul 2 2012, 16:03) You...   Jul 2 2012, 18:22
- - YellowOnion   I did my own loopback testing via sox after I was ...   Oct 22 2012, 23:07
- - Kohlrabi   Yet another hint to avoid ALIASUS hardware like th...   Oct 23 2012, 00:40


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