No luck on a receiver with pre outs, but I did just try my mom's portable CD player hooked up to the amp, again with no luck. I plugged it into the TV just to make sure it was outputting sound, and it was, so it's looking like the amplifier's the culprit. At least I know I'll be taken care of quickly.
That is a very good thing, since my sister will be visiting next month, and I want to show off my system to her and my brother-in-law. They've seen various incarnations, but I'm not sure if they've felt the subwoofer, and I know the amplifier wasn't present on their last visit.
