So i recently built my own bass and installed a musicman pickup and it sounds amazing at practice volumes but then i turned up my amp, (GK 400 rbIV combo with a 1x15), at band practice volumes and when i played anything on the E string it started distorting then clipping really bad then farted. I tried lowering the volume on the bass and then it farted and cut out real bad. i messed with the gain and messed with the master volume. and the eq was set flat. i think i have caused permanent speaker damage, i ended up switching to my pbass and the speaker had this weird distortion, but no farting or clipping no matter how hard i played. could it be the bass? I had a similar problem with my epiphone eb-o in which it kept feed backing and the guys from guitar center explained that i didn't have enough headroom Ive hit the search and read all the suggestions and i tried all of them except using a compressor. do i need more headroom or did i wire the pickups in a weird way?