I have no clue how big your club is, but having 12 large bass bins going is accomidation for at least twice that number of full range speakers running. A lot of very large clubs will use that number of bass bins.

Having said that... if you do have a big club, you could should probably be upgrading the number of full range speakers you're using as well as their quality. Simplifying things down to the bass bins and numerous 2-way full range speakers would probably improve the sound a lot.

If you have just a small club, you would still be better off cleaning eveyrthign out and simplifying it. You could probably do away with the 4 15" bass bins and sell them or something.

Anyway, just some thoughts for future upgrades. I've actually got plans to start my own club in the next few years as well, so I've been stewing over setups quite extensively.

You might also want to consider the selenium compression drivers such as these: http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Product_ID=6315&CATID=49 . I've heard they're actually quite nice and not as expensive as the PSD 2002's.

Adam