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post #1 of 11
3/2/11 at 11:05am
Thread Starter 

im new here so forgive me  i have a pc with xonar hdav 1.3 card into nad amp via optical  my question is at what volume should my pc be set  100% or what thanks

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post #2 of 11
3/2/11 at 12:25pm

Yes, set your PC to 100% volume.

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post #3 of 11
3/2/11 at 6:04pm

-3dB sound reasonable: http://www.gearslutz.com/board/tips-techniques/334385-intersample-peaks.html

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post #4 of 11
3/3/11 at 12:49am

Full resolution of all the bits you have require the digital volume on the PC to be at 100%.  Lowering the volume lessens the number of bits of resolution you have.

 

The link to which you referred is for recording not playback.  For recording, you would typically be wanting to keep your peaks at around -10dB.

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post #5 of 11
3/3/11 at 3:04am

What I understand is that a 0dB digital recording will create peaks that will clip at decoding, so it sounds reasonable to slightly attenuate the volume in order to avoid making the DAC chip clip?

 

http://www.hometracked.com/2007/11/08/prevent-intersample-peaks/

 

Under specific conditions, which I describe below, the DAC can produce an analog signal that momentarily exceeds the level of the digital signal from which it was converted.
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post #6 of 11
3/3/11 at 9:27am
Quote:
Originally Posted by leeperry View Post

What I understand is that a 0dB digital recording will create peaks that will clip at decoding, so it sounds reasonable to slightly attenuate the volume in order to avoid making the DAC chip clip?

 

http://www.hometracked.com/2007/11/08/prevent-intersample-peaks/

 

Playback and recording are two entirely different issues.  On playback at 0dB attenuation (all 1's) is fixed and the signal can never go above that level.  It's already been recorded, remember?
 

 

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post #7 of 11
3/3/11 at 9:49am

 

well, I guess it's open for debate...and some ppl tend to agree w/ me: http://www.hydrogenaudio.org/forums/index.php?showtopic=59392

 

If you reduce the level of the data before it hits the DAC then it should be able to reproduce what was previously an ISO without clipping. The peak is not "forever lost".

 

I normalized such a region of a 15 kHz sine wav (ripped from a home audio setup CD with test tones) so that peak sample value is 0dBFS. Now the above-mentioned intersample 'peak' is flat. Saved the file. Reopened it. Reduced level so samples peak at -3 dB instead. Et voila, the original rounded intersample peak is back. So I'm a believer.

 

Nothing's lost (yet), just compensate upfront and you'll be good to go. We're not talking about clipping per se...more like intersample clipping at the DAC stage, nothing's clipped in the digital domain.

 

A worst case scenario can end up clipping at +6dB though: http://www.gearslutz.com/board/geekslutz-forum/410284-maximum-intersample-peak.html


Edited by leeperry - 3/3/11 at 9:51am
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post #8 of 11
3/4/11 at 8:42am
Quote:
Originally Posted by leeperry View Post

well, I guess it's open for debate...and some ppl tend to agree w/ me: http://www.hydrogenaudio.org/forums/index.php?showtopic=59392

 

Nothing's lost (yet), just compensate upfront and you'll be good to go. We're not talking about clipping per se...more like intersample clipping at the DAC stage, nothing's clipped in the digital domain.

 

A worst case scenario can end up clipping at +6dB though: http://www.gearslutz.com/board/geekslutz-forum/410284-maximum-intersample-peak.html


So you're dealing with a systemic mis-calibration issue then, eh?  I guess that might be expected with some consumer level gear.

 

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post #9 of 11
3/4/11 at 10:27am

Well, Miss Calibration's really cute. And there's no other way to avoid intersample digital clipping than to slightly attenuate the volume in the digital domain.


Edited by leeperry - 3/4/11 at 10:28am
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post #10 of 11
3/4/11 at 10:54am
Quote:
Originally Posted by leeperry View Post

Well, Miss Calibration's really cute. And there's no other way to avoid intersample digital clipping than to slightly attenuate the volume in the digital domain.


It's not done in a production environment because the equipment levels and metering are all calibrated to the same standards, from all 0's to all 1's.  Multigeneration copies are bit for bit exact copies of previous generations, not each reduced by 3dB.

 

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post #11 of 11
3/16/11 at 7:18pm

Nice.

 

Welcome to our forums batche and sorry for the wallet.

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