That is why I made some using a good quality coax cable, as advised by a respected phono stage designer.
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you do get current spikes in the USB cable. The USB cable has resistance, a small voltage is induced between the USB audio device and ground at the other end of the USB cable. This isnt much, but devices like phonos only generate a few thousandths of a volt, so it's plenty of signal to cause havoc if it gets back into the preamps.
good youve got culprit...
I was just reading the other day about USB creating ground loops but I didn't think you were using one.
I forgot it was still plugged in, to be honest. I do have one going from my PC to the DI, but that is fine.
It turns out that the USB cable was not the culprit, even though I thought it was.
So, I bought an iFi iPurifier for the mains. It did nothing so I sent it back.
Next up are some ferrite chokes on the SE cables. So far, so good, but I need some more time listening.
It may still be there, but at a much lower level, which may be acceptable.
You need one of these Kevin, it will probably cure all your noise problems. I heard one here the other day it was totally gobsmacking but so is the price!:eek:
https://www.futureshop.co.uk/chord-p...caAnk-EALw_wcB
:lol: