05-28-2020, 10:40 PM
(05-27-2020, 01:42 AM)Tim Curtis Wrote: The audio interfaces are different for your two DAC's and so results can be different.
The USB DAC will be using the universal Linux USB audio driver and its "Quirks" file that contains definitions of USB DAC's and their custom requirements. Your DAC is prolly in the Quirks file and its correctly reporting its max sample rate of 192K.
The I2S DAC has its own custom driver and so more likely to not cause issues.
Also, ALSA will always try to provide the bit depth that the audio device accepts. it zero-pad's it so no loss of bit-perfect-ness. This all happens behind the scenes.
What exactly are you trying to achieve with regard to resampling and your two DAC's?
Yep... Due to my Schiit being a USB device, the data has to flow thru a USB interface, and of course whatever is the slowest link will define the limits.
I'm curious as to what's in the Quirks file for the Schiit... where is that located? And yes, sounds like it's correct, in that it seems 192khz is the right "top speed", for the USB interface, but I'm interested anyway.
A good question would be, since it can change or limit to 192 when I resample to something higher and play successfully, why does it NOT do that when the crossfeed/EQ is engaged?
Overall, was succumbing to a bit of audiophilia.. just thought I'd play with higher bitrate resampling and see if it made any difference. On the Allo Boss, I think you get the filtering turned off, so that might actually be audible. The Schiit, using a different chip, probably not. The Modi 3, I thought was good to 32/384, especially since it played when I set it there...
but as we see, appearances aren't always what they seem. Also was trying to crosscheck the earlier poster reporting a sudden similar problem since I had 6.4.2 and a 6.5.2 players handy. I saw the problem on both, so I'm wondering if he also did the same thing I did, inadvertently change sample rates. Would be good to hear back from him to see if his issue is actually the same kind of thing.
