|
MTUSUPPORT's suggestion is the easiest fix.
The problem is there is a "ground loop" in the wiring between your amplifier and your laptop. The ground wire between all your devices and the building ground (typically at the power box) is too small for audio. All the devices in the building are "talking" over the ground. If you always do shows in this building, you may want to do what audio studios do; get a THICK braded ground wire (Monster Cable is the best) and run it from your power strip back to the ground somewhere, if not the power box.
Also be sure you plug both the amp and laptop into the same power strip. This will reduce any voltage difference between the two grounds, that can cause problems between two devices (amp and sound card) hard wired together.
|