Ask any audio enthisiast and they'll tell you that SVS makes some of the very best subwoofers in the world. The 16-46CS is one of their most powerful models. If you've ever heard one of these babies in action, you know that the sheer amount of power and brilliant output quality makes for an eyeopening experience. If not, then here's your chance. The item is in mint condition and it has only been used for a grand total of 10 hours. Long story short, it nearly got me evicted. I also have a PE monoblock amp to go with it, mint and used for exactly as many hours. It's the perfect companion for this subwoofer. Asking $525 for the sub and $150 for the amp. I paid about $900 for both.

http://www.svsubwoofers.com/subs_cs_16-46.htm