Topic: [FF400] Ground loop when USB audio device connected to Fireface
I am experiencing a ground loop when connecting a USB-powered audio interface (specifically an MBox2 Micro) to the inputs of the Fireface 400.
The MBox2 is connected to the Fireface via a stereo mini jack to two mono jacks cable. The Fireface and MBox are both bus powered.
In an effort to break the ground loop, I've disconnected everything inessential from the PC, so that its only connection to the outside world is a single power lead. (I even unplugged the monitor.) The ground loop remains exactly the same.
Would using a different cable to connect the MBox to the Fireface help? Or is the problem something to do with the wiring in the PC? (Sorry for the dummies' phrasing - I can't figure this out...)
Thanks in advance for any advice.