Well, that did nothing. I tried the speaker cable in the left channel inputs, and it's the same thing. I also checked the speaker level settings via the receiver, and they're both set to 0. When the static tone was sent to the right channel, it's very quiet and dull sounding.
I didn't say, but when my 3801 suddenly shut off, my contractor was working directly above it with a damp sponge wiping Dap to finish off my newly installed crown moulding. I was listening to music when it shut off. At the time, I told him that I bet water dripped from the sponge and shorted my receiver. It looks like that's the case, whilst zapping my monitor 9, too.