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Upsampling Background
#1
I posted this in the DIYAudio Moode thread in 2015, but I think it is worth putting here in the more focused thread.

John Swenson discusses his experience with upsampling in the following slimdevices forum post:

https://forums.slimdevices.com/showthrea...mpressions

This started me on my experiments using SoX inside and outside Moode looking for the best match for my system. I think one group of SoX settings my be optimum for one DAC/Pi combination but not for others. As I've mentioned, I like SoX medium quality upsampling to 384/32 for my Allo Boss 1.0 on both my Pi2 under 3.8.4 and my Pi3Bplus with 4.1.

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#2
Very interested in this topic and the different matches.

My first line of thought was: who would I trust with upsampling? my $40 RPi running off the shelf software or my $1500 DAC? So I left the audio bit-perfect from the RPi (the very reason I bought the Pi and why I did everything I did!), and left my DAC to do the audio processing.

I may have under estimated the scenario, I am looking forward to some experimentation.

I'll report my findings wit external USB DACs which is all that I have.

Best regards,
Rafa.
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