@ SpeedyPC, do a search for
Aura Interactor, it can be purchased over here in Australia for around $50, it comes as a back pack but totally useless this way, I removed the subsonic transducer and screwed to bottom of chair through rubber gromets, this is essential to allow it to move & not viabrate with high pitches. I have had mine installed for around 3 years now, it really works well with in game shock waves, most people don't realize that very low (subsonic) waves can't be heard, but can be felt!
