I am building the waveshield into an artwork/movie prop, and would like to put a battery powered amp. I need something that has a good bass output to simulate a nice "electrical generator" rumble
I am thinking of some sort of busking amp or something, needs to have a good output (so Ipod type speakers are out) without running of a 12v huge car battery...
also around the $20 mark would be good!
I saw someone who made a 'ghost busters proton power pack' on the ne some place and they suggested one, but cant find it anywhere now...
Any ideas?

