So, I recently built a new Mini-ITX computer, and I'm having trouble with noise. The problem is, connecting my PODxt to the new computer through USB introduces significant noise to the signal coming right out of the PHONES output on the PODxt. If I unplug the USB cord, or turn off the computer, the noise instantly goes away.
I found a few forum threads on the Line6 boards with people describing the same problem, and ground loops are frequently suggested as the culprit.
Everything (computer, PODxt and monitor) are connected to the same power strip, which is of the two-prong type. There are no other devices plugged in. It's the exact same way as my previous setup, the only variable being the new computer.
I'm anxious to get on with my project, so any help or suggestions would be greatly appreciated.
EDIT: I've tried using a different power outlet. No luck.
I've had a noise problem with my laptop connected to my Spider IV amp. I run the phones out from my laptop for drum machines and backing tracks. When the laptop is plugged into the wall outlet, it would be extremely noisy. When I let the laptop run on battery, there was no noise at all.
With the mini-ITX, you won't be able to just switch to battery. What were you running before you built the new computer?