raoul_duke

Yes, the sub is set to "auto-on", so I hear the boom only when it gets a signal below 120 Hz and turns on from standby mode. I can flip the switch to just "on" and see if that replicates the noise. I'll try your procedure of letting it set overnight and see what we get. *** Update: After reading your comments, I tried the following: 1. Flipped the toggle switch to "on" from "auto"; watched TV as normal and it happened right away - this didn't tell me much. 2. Shut everything down and replaced the cord from the amplifier to the sub; it still happened - problem not the cord. 3. Turned the power back on and let the sub sit; I heard one boom without any input signal - problem is the amp. Now, where do I get the replacement part? Thanks for the help. I noticed right away my music lacks depth without the sub. No comparison.

I'll try another cable, but I suspect it's more involved. I'm pretty handy with an ohmmeter and a soldering iron, so I'd like to attempt a repair. Do you know if there is a replacement amp for a KSW-10 from Edwards or other electronics supply? I read about replacing an amp - doesn't seem that hard, or am I wrong?

I bought this Klipsch subwoofer (KSW-10) new around 1998. It's worked great for 19 years until last month. When I start watching TV or a DVD, I will usually (but not always) hear one or two loud "booms" in succession. It's not a part of the soundtrack. This happens about five minutes into the program but only if the sub hasn't been used that day. I'm getting settled into a show and out of nowhere it sounds like a heavy book hitting the floor from a top shelf. This never happened until recently and I made no changes to settings or setup. No sudden weather changes either. The sub still works, and I haven't heard it happen with music (even with a pipe organ CD.) I did try to turn down the level from '11' (yes, it really does go to 11) to '6'. It still happens and now more frequently. I searched Google, the FAQs and other forum posts and haven't turned up any answers. Has anyone run into this problem before? Thanks