i noticed today that the my left depth sub does not work i have a stereo setup with my Lexicon processor using two subs and an LFE. i moved the sub over to the right sub using the input cable and power cable no luck, checked the fuse no luck the only thing i notice is when i pull out the power cable it makes a very loud thumb which the other subs does not. any suggestions? if not can you give me Jim Powers email address to martin logan. thanks