I've got the XSUB12, and it hits extremely hard. It's actually too much for my room, as it rattles everything in the house. I've taken it apart. Here's a photo of the amp. It's massive, and the magnet is 70oz. It doesn't go as low as the bass in my truck, but it's right up there with the BIC. The three listed are the best deals for 12" subs. My only upgrade would be to an SVS, which I'll be visiting their showroom on 7/22. I'd say Cadence overdid it with the woofer and amp, and under did it with the size of the box. They are known for their car amps and subs, so it's built like a tank. I think they sacraficed the bottom end with the size of the box. Heck, it still weighs close to 50lbs!