New MM series speaker wiring in my Crownline

AjsCrown
AjsCrown Posts: 6
edited June 2013 in Car Audio & Electronics
These speakers say they are "compatible" with 4 ohm systems!
But,they are 2.7 ohms!! I am planning on installing 4 of the MM691s under the rear bench seat of my boat. 2 of them are installed now. I have a Kenwood KMR-555U head unit,along with Alpines,PDX-5M Amp.
My question is this,
how do I install 4 of the 6x9s,@2.7 ohms apiece on the rear channel safely,without burning up my amp???
Alpine says the amp is stable at 2,or 4 ohms!
Thanks for the help!!
Also would like replys from the Polk tech guys who know without a doubt how to wire them!!
Please keep the guessing to yourselves.
Thanks again!!