Snaaake, Surround sound cabs have been in many 80s games. TX-1 was a sit down driving game that has 4 speakers... and Disc's of Tron Enviornmental also has surround sound. Im sure theres more... just cant remember them now.
Unfortunately... I dont think mame supports true 4 channel output for games that used them : (
Tho... theres nothing wrong with being prepared
And also, using simulated surround modes like 'stadium'. the echo effect might be quite nice. Not to mention... pc games and or movies could be ran.
BASSOFeeSH, I was thinking of making telescopic extending tubes that I would hang from the top of my cab...as mine isnt enclosed. You could do something simular - without the telescopic stuff... by mounting some metal or think wood dowel poles to the sides of you cab... or if its internal... maybe make holes to mount the enire assembly inside.
Also, If you really want an awesome experience... get 'Bass shakers' and put them under your chair. They are like subwoofers.. but they only vibrate instead of moving air arround.