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Old 28th May 2014, 04:49 AM   #1
r010159 is offline r010159  United States
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Default DACs and aliasing

I have two DACs. I have been playing the same material, first on one DAC, and then the other. One DAC has a type of distortion, kind of like an inharmonious quality to the sound, in the highest register of a singing voice. The other DAC does not have this problem. I did check for clipping but where this happened had no evidence of clipping.

Could this be aliasing? How would this be possible for a DAC? I thought oversampling and the reconstruction filter takes care of this. Can there be a difference in how one DAC reconstructs the analog signal compared with another DAC?

Bob

​PS: I wonder what aliasing actually sounds like.
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Old 28th May 2014, 09:18 AM   #2
sesebe is offline sesebe  Romania
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some details....
what DAC chips?
what kind of filtering?
what kind of supply?

this answers will help us to help you...
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Old 28th May 2014, 01:27 PM   #3
r010159 is offline r010159  United States
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The DAC with the audio artifacts is the ODAC/O2 and the DAC that is better is the Apogee Duet 2.
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Old 28th May 2014, 03:45 PM   #4
r010159 is offline r010159  United States
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Quote:
Originally Posted by sesebe View Post
some details....
what DAC chips?
what kind of filtering?
what kind of supply?

this answers will help us to help you...
I figured out it is mostly the recording that has this problem.

Bob
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Old 30th May 2014, 11:48 AM   #5
oshifis is offline oshifis  Hungary
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But you wrote "I have been playing the same material" ...
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Old 2nd June 2014, 12:29 PM   #6
sesebe is offline sesebe  Romania
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Hi,

It is dificuld to say but, if you have right and was exactly the same digital signal, the DAC with distorsions it is posible to be more detaliated, more precise but, on the other hand, the DAC without distorsions can be considered that sound better because it manages to hide this kind of distorsions using a better filtering.

These considerations are correct only if was a distorsions in recording, if not ...

I personaly I prefer the a DAC without distorsions because it is not clear if distorsions was because of the DAC or was in recording. In both cases without distorsions the sound is better.
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Old 3rd June 2014, 11:09 AM   #7
DF96 is offline DF96  England
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Aliasing does not happen in a DAC. It happens in the ADC, if the anti-aliasing filter is faulty.

You may be hearing the effects of imaging, which happens in a DAC with poor or absent reconstruction filtering (such as many NOS (non-oversampling) designs). The ultrasonic images (which are themselves inaudible) can create audible intermodulation in whatever follows the DAC.
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