Need help matching up a decent sub to my amp

[rb8484 10+ year member]

Hey guys. I am upgrading the sound system on my pontoon. I just put 2 pair of Polk 6.5" speakers in, I bought a Polk 660 amp. I was told by someone that I can run the 4 speakers off 2 channels and run a sub off the other 2.

What would be a good sub to run for this set up? I dont want to spend alot of money due to the fact its on my pontoon. Is there a free air sub that would be decent, or are those a bad idea?

Send me your thoughts and ideas. Not for sure if I will put a sub in, but Im entertaining the idea

Thanks!!

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[mclerico83 5,000+ posts]

https://www.google.com/shopping/product/13018132752831478815?q=marine%20subwoofer&hl=en&safe=active&bav=on.2,or.r_cp.r_qf.&biw=1600&bih=799&sa=X&ei=fyNmUcjZNIWD0QHizYCIDA&ved=0COQBEPMCMAc

https://www.google.com/shopping/product/13478514978812962065?q=marine%20subwoofer&hl=en&safe=active&bav=on.2,or.r_cp.r_qf.&biw=1600&bih=799&sa=X&ei=fyNmUcjZNIWD0QHizYCIDA&ved=0CJsBEPMCMAE

id get something in an enclosure

Kicker 11SKM10 10" 4 ohms KM Series Marine Subwoofer Enclosure

id rin the kicker with the waterproof air tight box with mounts

 

[mclerico83 5,000+ posts]

https://www.google.com/shopping/product/13018132752831478815?q=marine%20subwoofer&hl=en&safe=active&bav=on.2,or.r_cp.r_qf.&biw=1600&bih=799&sa=X&ei=fyNmUcjZNIWD0QHizYCIDA&ved=0COQBEPMCMAc

https://www.google.com/shopping/product/13478514978812962065?q=marine%20subwoofer&hl=en&safe=active&bav=on.2,or.r_cp.r_qf.&biw=1600&bih=799&sa=X&ei=fyNmUcjZNIWD0QHizYCIDA&ved=0CJsBEPMCMAE

id get something in an enclosure

Kicker 11SKM10 10" 4 ohms KM Series Marine Subwoofer Enclosure

id rin the kicker with the waterproof air tight box with mounts