Klipsch LF-10 Subwoofer Speaker

Pros: Clean, low, accurate bass energy; Great Klipsch warranty
Cons: Can be expensive, and hard to find.

The LF-10 uses a single 10" active bass radiator, couple with two 10" passive radiators, in a vault-like sealed enclosure.

Klipsch discontinued this model due to copyright infringement issues with another manufacturer that shall remain nameless (here).

The output: scary. Have you ever gotten a stomach ache from low frequency sound waves? I have, and it felt great. Wen I have invited friends over to watch U-571, I never get tired of the expressions on their faces; shock and disbelief.