Thump - What's going on?

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Thump - What's going on?
« on: 22 Dec 2003, 04:42 pm »
Out of nowhere, my subwoofer thumps when I do various things with my receiver. I get a thump out of my subwoofer when:
- I go from analog to digital while watching TV
- Turn the volume to 0 on my receiver
- Change channels while in digital
- Change the mode (e.g. Stereo to Dolby, Dolby to 7ch stereo, etc.)

I plugged the interconnect into the sub while it was on, but didn't getting any strange noise when I did so.

Any ideas what is causing this, and how I can fix it? Did I blow a fuse?