I built this custom set for a buddy a few years ago. He wanted to FEEL the grenades/bullets in Battlefield.
The sub sits under the desk and also serves as a foot rest, and the left & right are mounted on the walls to either side of monitor.
Silicon Lined and sealed, finished in black automotive simulated leather - and yes the flames are "Poofy/Soft" like a car seat - an idea I had to simultaneously decorate the boxes and dampen any vibration.
And they DO produce some note-worthy vibrations, powered by a dual-bridgeable 2 X 800Watt CH Car amp, a car battery and a custom inline power supply I built myself - the satellites remain left-right separated and the sub runs on the full 1600Watt's - these things make your keyboard walk across your desk if your hands aren't on it.
... and at full power may cause HDD failure...
... but no sane person would WANT them at full power...
I only bring this up as he may be moving to another country in a few months and looking to sell them
...
Edit - Sorry for the crappy Pics - a the time I only had a cheap Cell-Phone Camera on hand.