I purchased both the Polk MMC650 and the MMC690 6x9's
with two Polk MM2084 Sub's. I have the 650's and the 690's on a RockfordFosgate 425.4channel amp. The subs I have on a RockfordFosgate 325.2channel amp. They sound great !
I mounted the 6.5 and had to cut my panels...took a bit of patience and ultimately I place them on small panel mad out of starboard and then placed the starboard on top of my cutout. Made the mounting much easier for me. As for the 6x9's I was going to place them on the side panels next to the rear bench but didn't want to go thru the hassel of cuting my panels again so instead I built two small boxes that house both the 6x9 and my sub seperately in each one and placed them under the rear bench.