Hooked my '88 800RB up to my 6x10 last night, and it didn't work. The power came on, the lights were on, the speakers moved a little when it powered up. But when I started playing, there was no sound. I checked the fuse; it was fine. Volume knobs were up. I noticed that the little residual "hiss" from the amp (the normal "airy" sound that exists with all amps) increased through the speakers as I moved the 300W volume control, but I still couldn't get bass sounds. The bass was passive, the cables are good, and the cab is almost new and works well. I was plugged into the correct output jack on the back. Any ideas? Thanks!