Article from the New York Times
As if video games weren't intense enough, the Pyramat PM220 chair transfers the rollicking action from the screen to your stomach.
This rocker is actually a large subwoofer-and-speaker system that vibrates and pulses in time to the on-screen action. The seat, ergonomically designed for hours of gaming, has built-in audio ports and can hook up to any device with audio outputs. It is compatible with almost any device, from the Xbox 360 to the Nintendo DS. The PM220 also has a side connector for piping music from an iPod or other MP3 player through the three internal speakers.
Two of the speakers, rated at eight watts, are embedded in the back of the chair and another, more powerful 28-watt subwoofer is hidden under the seat. The chair connects to the television using an RCA cable, which is included.
The chair, available at Target stores for $99, has a washable seat, folds for easy storage and comes in black with blue piping. You can even connect several chairs together for group play.