I like the idea but the problem is that the BK uses the the bass/center chanel and not the stereo side channels as input.
I don't know if a simple stereo output will give different bass output.
If we can have a 5.2 instead of 5.1 stereosystem, that would be awesome.
In general I think it's hard to tell from from where a low frequency sound is comming from, especially when it's going through an airframe.
One system that might produce this effect is d-box, but that's another league when it comes to money.
I uses a special code imbedded in the game/movie that can rock your chair and give vibrations just like the buttkicker.
And as it uses 3 points for the feedback so it should be able to reproduce it on only one side, but it's depending on the coding.
_________________________
..and lead us not into temptation......I'll find it myself.