I am working on a project which involves mounting a small modified 5.1 surround sound system for a computer onto a bike. the center speaker, power switches, and volume knobs all need to be mounted to the front of the bike, sturdy enough to withstand bumps and going on and off curbs occasionally. The speaker's control box with the 4 knobs is about 6 or 7 inches wide, about an inch and a half tall and about 3 or 4 inches deep. The other 5 speakers have been mounted in a cabinet and will be attached to the rear rack. the center speaker is a little wider but not as deep.