sakeido
Contributor
Isolation transformer! I'm telling ya. They're cheap.. try a passive one like a Palmer PLI01Same. I had to spend like $3500 a couple years back to replace a bunch of wire/transformers (or something) with my electrical system. I have a focusrite interface and windows pc all plugged into a Tripp Lite Isobar and every single guitar I got has a noise floor that annoys me to death. Somethings gotta be up because there's no way every guitar/bass I have is wired like shit.