Installed this (BOSS- MCBK400- ALL TERRAIN SPEAKER & 600W. AMPLIFIER SYSTEM ), hooks into my MP3 player, and you still have the whole front rack to use.

volume control knob.

small little 600W. Amp.

Wife made me a MP3 water resistant carry bag that slips over brake leaver, and mud guards for speakers out of an old golf bag head cover.

Thanks for looking.