This isn't bass related but it is driving me nuts so here goes! Our lead singer plays rhythm guitar. He had this bright idea about 6months ago to change his pick ups out of his LTD guitar and put EMG active pick ups In. Well ever since he has this gawd awful feed back if he turns towards his amp or turns a particular volume knob. he did take it back a couple times to have it fixed but they keep saying nothing is wrong! Our last show his amp blew up right at the end of our 4th song ( it's a brand new amp)so we continued with lead guitar and me ( to my delight anyways) my question is if an active pair of pick ups are wired wrong could it actually blow up an amp? I don't think pick ups powered by 9volt could cause such damage but could it? Just wondering!