Originally posted by thechicken:[..]
You can try it, but to me it sounds like a great way to blow a speaker or some other component.
How loud does this amp sound with a guitar?Loud enough?
happen.
No, not really. It's a relatively small amp, but going in to a relatively BIG speaker. My plan is to line it up like this and see if it works- if not, I can return the cheap little preamp thing, I checked with the guy from GC, he said it's worth a shot-
Mic into Amp
Amp's Speaker Output into Preamp Input
Preamp's Output into Speaker Input
I bought a different version, too, which actually has a meter on it so you can see when you're reaching potential speaker blow. We'll keep it way below the line to save our asses. But this way, the signal is boosted between the amp's output and the speaker's input- we're not boosting the gain going INTO the amp, causing a blow. We'll basically be overriding the amp's volume and instead leveling off of the preamp's volume knob.
This is all completely experimental, and I have NO idea if it'll work. But we all chipped in for some of this equipment, and we're not risking any of our nice stuff (expensive amps and mics), so there's not TOO terribly much to worry about. If it doesn't work, each of us is out roughly 10 bucks. I can deal with that.
I've just placed the order now (musiciansfriend.com), so I'm expecting it by about this time next week. Ahhh! 
But to me piano seems like a whole different ball game. What do you say? 