NA710.5 - MB Quart 5-Channel 710W RMS Class AB Nautic Series Marine Amplifier
BEST BANG FOR THE BUCK IN MY OPINION.  This powers the 4 factory Jensen speakers and an aftermarket 10&#34; MTX tm1004 marine subwoofer.  Thanks to this amp the bass pounds pretty hard even at 45 mph.  It makes the factory speakers sound better as well.  I am not a fan of Jensen products so I will be replacing the 4 speakers down the road.  For the money I think it would be hard to beat.  No distortion, funny noises etc.. just good power.  I had it installed by a sea doo dealer and they put dual air vents i