Bridging Jensen 2-Channel Amp?

Hi everyone, Im fairly new at car audio, and i have a question for you guys. I recently bought a Jensen JPA285 2-Channel Amp for a really good price. The specs can be seen here: http://www.onlinecarstereo.com/CarAudio/ProductDetail.aspx?Source=googlebase&ProductID=17180 I have room for ONE subwoofer in my... show more Hi everyone,
Im fairly new at car audio, and i have a question for you guys.

I recently bought a Jensen JPA285 2-Channel Amp for a really good price. The specs can be seen here:
http://www.onlinecarstereo.com/CarAudio/ProductDetail.aspx?Source=googlebase&ProductID=17180

I have room for ONE subwoofer in my truck, so i would want to bridge the amp to get the most power, right?

If so, the amp info says "Bridgeable for mono operation (4-ohms only)"...does that mean i need to find a subwoofer that is 4 ohms? And with the amp i have now, what would be the rms or max power the sub would need to have? Could anyone make any suggestions? I'm looking to spend around 50-75 bucks or less.

Thanks so much for the explanation guys!
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