No problem here, just a question. Last Christmas my father-in-law gave me a nice subwoofer 18"x18"x18" which sounds terrific. I run my left and right to it, it uses the deep bass, according to a dial setting, and returns the rest of the sound to my receiver. I guess it has a pre-amp or something. It has an on/off switch on the back which I've left ON forever. There have been no problems, and I've always thought it was passive in nature, so no harm while the rest of the stereo is off. Surely, nobody reaches behind their subwoofer to turn it on/off every day. It occured to me lately, I sure hope there's no harm because it would be tragic if this subwoofer stopped working. Any ideas?