Is this subwoofer active or passive?

http://www.carid.com/boss-audio/10-phantom-series-2100w-4-ohm-dvc-subwoofer-mpn-p106dvc.html

I am buying things for my 2011 Honda Civic and I want to know if this subwoofer is active or passive. I need to know if I have to drop more money on any amplifier or not. Also I bought a set of 500w speakers as well. Do speakers alone make your music louder or is it the subwoofer alone? Thank you!

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