I have a MTX subwoofer with my surround system and the other day I moved my subwoofer to hook up new dvd player and I got some backfeed and then the fuse blew. I went and got more fuses and it immediatley blows the fuse again. I had it all unhooked from the reciever and it still blows the fuses. I since then bought another sub and this one hums constantly when the volume is low. I have a filter hooked up and it still hums.Can anybody help?