MBox 2 Pro - noise on o/p issue

[Donny]

I believe you need to get hold of high quality balanced cables. The output of the MBox is balanced and its likely your connecting it to an unbalanced source.

[thenewyear]

Thanks Donny,

I am going unbalanced into the Hi-Fi's phono connectors. I fully expect and accept that I lose 6dB when doing this but it should not induce processor dependant noise (it didn't when I had an original USB MBox).

Interestingly the noise dissappears if I unplug the Mac's in-built audio from the Hi-Fi amp and use just the MBox and vice versa.

I am going to try lifting the screens on one set of audio cables to see if that breaks this interference loop. Otherwise I might have to come up with some way to transformer isolate one set of audios. What would be a cheap way of doing that?

VERY frustrating when this whole system worked fine with a USB MBox.