MBM-12 MK2 Mid-bass Module
One exhibitor, Hsu Research, had a setup that literally stunned me. In the back of the room where I was sitting, right behind my chair, was one of his new designs, called the MBM-12 Mid-Bass Module, that only reproduces the range from 50 to 150 Hz. He had it set for the range of 50 to 80 Hz. Since it is close to the sitting position, it does not have to be turned up very loud, although it has a 350 watt amplifier. The driver is lightweight, so it responds very quickly. The gunfight scene from Open Range was used for the demo, and the gunshots, because of that special woofer (of course, he had his regular subwoofers in there too, for the really low frequencies), sounded as close to real as I have ever heard in a home theater room. The effect stuck with me all afternoon. Anyway, if you ever have the chance to hear this demo at a local home theater show, be sure to sit in on it. Absolutely unbelievable! "
Dr. John Johnson, Secrets of Home Theater and Hi Fidelity