If you don't want to spend several hundred dollars for the Velodyne analyzer/equalizer there are other alternatives. For about $99 you can get a Behringer Feedback Destroyer (BFD) which is a 12 band parametric equalizer for solving bass response issures. You use it in conjunction with a Radio Shack analog Sound Pressure Level meter, a disc of test tones and an excel spreadsheet. While its more work to understand and set up, you can be very precise with it. If you want to know more let us know or search the internet or forums under the BFD name. I think the $99 dollar BFD is model 1024P. You learn a lot messing around with a BFD.