A friend of mine got a pair of $50US headphones with force feedback. Yep that right, the headset rumbles like a joypad when your listening to music with bass or when you get hit with a rocket in Q3. I only tried them on for a minute, but they worked very well, I was impressed with the responsiveness of the rumble.
I have a 4 channel amplifier system which i built a long time ago, it has 500 Watts RMS per channel so that's like 2000 watts RMS in all, i use four buffles with horn tweeters and 24 inch woofers... just imagine if i played those things at full volume inside my house, it'll probably demolish everything... ehehehe KABBOOOOOMMMMM!!!!