Originally Posted by Bassboy9764
I recently played a show and the sound guy sent a line-out from my amp and asked if I had a ground lift. I said I didn't and he seem surprised for some reason and came over and confirmed that my amp (Ampeg SVT-4Pro) didn't have a ground lift.
Ever since I've been wondering what the heck a ground lift is.
Typically amps have a switch for the DI that when switched on, or "lifted", can eliminate ground loop hum from the wall socket that makes a lot of noise.
I'm surprised that your amp doesn't have one too.