I just installed the MM691's and the and the MM651's in my Maristar. I put the 6 x 9's in the front and the 6 1/2's in the rear. I am driving them with a Rockford Fosgate "Old School" amp. Crazy thing is for the first few hours of playing them the day I installed them I wasn't happy with their sound. As I waxed the boat the next day however I left the stereo on and as the hours went by they sounded awesome. I actually found them on Ebay for around $240.00 for both pair. The 6 x 9's are really fantastic! They almost drown out the sub in the back of the boat. I also have a pair of their 6" MOMO's on my tower with a RF amp. I would not hesitate to put these great looking speakers in your boat! And remember about the break in period, after a few hours you won't be disappointed.
1996 Mastercraft Maristar 225 VRS
2006 Kawasaki STX-15F
2006 Mustang GT