in a nutshell, here's what happened. i keep my sub on all the time. (klipsch ksw-10) one day figured out that my sub wasn't working. for how long? i'm embarassed to say i don't know. i started running test tones, cranking up the sub volume, etc. no luck. i thought for sure my sub was busted. hooked it up to my other receiver in the bedroom and it started working fine. put it back outside in the living room and it's now working fine. so, i wonder why it stopped working and why all my efforts (before i took it into the bedroom) failed. any ideas?