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Author Topic: WASAPI and Distortion  (Read 2602 times)

dmitchell

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WASAPI and Distortion
« on: January 04, 2013, 12:51:34 pm »

Has anyone else noticed distortion when using WASAPI? I have experienced it on two of my systems, on both Win 7 and Win 8, both regular WASAPI (push?) and event-mode.

If I change the output format from WASAPI to either DS or Kernel Streaming, and turn the volume on my soundcard down to around 85%, the distortion goes away.

As mentioned, this occurs on both my desktop system - using a USB headphone amp, as well as my 2 channel "reference" system at home (optical connection from soundcard into a high-end DAC).

Thanks.
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JimH

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Re: WASAPI and Distortion
« Reply #1 on: January 04, 2013, 01:06:30 pm »

Are you using build 106?  It's at the top of this board.
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dmitchell

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Re: WASAPI and Distortion
« Reply #2 on: January 04, 2013, 01:08:58 pm »

I don't think it's specific to a particular build. I notice it in both 104 (at home) and 106 (at work). For what it's worth, I don't think it's a MC issue, either, I think it's actually WASAPI, because I've noticed the same issue with Foobar.
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JimH

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Re: WASAPI and Distortion
« Reply #3 on: January 04, 2013, 01:09:31 pm »

What type of files are you playing?
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dmitchell

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Re: WASAPI and Distortion
« Reply #4 on: January 04, 2013, 01:11:41 pm »

flac and wav. Happens with both formats.
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Matt

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Re: WASAPI and Distortion
« Reply #5 on: January 04, 2013, 01:16:52 pm »

Clipping or distortion should not occur at 100%.  Do you have any DSP enabled?

You can use 'Audio Path' to check:
http://wiki.jriver.com/index.php/Audio_Path
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Matt Ashland, JRiver Media Center

dmitchell

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Re: WASAPI and Distortion
« Reply #6 on: January 04, 2013, 01:18:53 pm »

Nope, no DSP enabled, and the audio path tells me there are no changes being made. I agree, there should be no distortion even at 100%, but alas, it is there.
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Matt

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Re: WASAPI and Distortion
« Reply #7 on: January 04, 2013, 01:36:26 pm »

I would take a close look at the audio hardware.

This statement makes me wonder if it's related to WASAPI at all:
Quote
If I change the output format from WASAPI to either DS or Kernel Streaming, and turn the volume on my soundcard down to around 85%, the distortion goes away.

I mean, use 'Internal Volume' and turn the volume down and it might remove the clipping just the same.
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Matt Ashland, JRiver Media Center
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