Opinions On Polk Momo Mm12

[V1G1LANT3]

I know most on here are into the big systems with a lot of power, but what's your opinion of the quality of Polk.

http://www.polkaudio.com/caraudio/products/mm12/

I already have two of these and have had them for a while. It sounded really weak with the amp I had on it..which was the polk c300.2 I believe (one amp to each sub). Not sure if someone led me down the wrong path with those but I wasn't impressed, but I always seen some videos of them sounding pretty good on the internet.

What would be a good amp to put to these.

Thanks.