Quote Originally Posted by bobbyf6b View Post
I think a small pre-amped sub is the way to go. Easy to install and remove when needed.

I put one like this under the seat in my Ford Focus and it booms.

Attachment 12229

http://www.onlinecarstereo.com/CarAu...rm_LoPro8.aspx

(just an example)
Only thing is, making boom inside the small confines of a Ford Focus and making boom on a bike are two very different things. I would be very surprised if that sub would be very satisfying. But, who knows.