[SOLVED] Audio glitching on Pi 5

[robkyf]

Thanks @DRONE7. 

The Audiolab 8200CD is a decade-old design but still sounds good to my ears. There is a CDQ variant that has ’proper’ preamp capabilities, but the simpler CD model I have is primarily designed to be a straightforward CD player with added DAC functionality. There are filters but they’re at the output end. 

My model only allows asynchronous USB so I can’t change the way it ‘pulls’ the audio stream from the Pi 5. 

I’ve tried switching on SoX resampling in moOde and experimenting with different bit/sample rates, but any changes make the Audiolab seriously unhappy: at lower sample rates the glitching seems to be less frequent and loud but is still there; at high rates it goes crazy and loses the USB lock. 

The output from lsusb doesn’t seem to report anything more that the presence of the Pi 5 USB2/3 ports and the connection to the Audiolab DAC. 

It was worth a try but I’m still left thinking there is some basic mismatch between the Audiolab and the Pi 5. But as mentioned in my previous posts, moOde running on my Pi Zero 2 W into the Audiolab works perfectly so all is not lost…