Triode wrote: 
> The internal processing of usb audio is likely to be 24 bits for all
> cases and will fill the lower 8 bits with 0s.  However if you have
> replay gain enabled or the volume set to less than 100% then the bits
> may be altered by the gain setting and this will alter all 24 bits. Some
> Dacs such as the Audiolab MDAC monitor the number of bits which are
> changing and use this for the bit depth - people notice that the dac
> reads 44/16 at 100% volume and then it changes to 44/24 if you change
> the volume.  Is this the case for you, or perhaps the dac is just
> measuring that there are 24bits per sample being received.

Hi Triode, thank you very much for your explanation. I don't have replay
gain enabled, but I do control the volume at the Touch rather than at
the preamp (surprisingly to me, this sounds more transparent -- i run
both the Dual Core and the preamp with no attenuation). I'll try
reverting to using the preamp volume as a test.

Guido F.


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