I installed a PG Cyclone in the late 90's and it was a pretty cool creature. Worthless above about 50Hz but within the proper range it sounded beautiful. We did it in a 3cuft sealed box in a 4 door civic. Had a pair of 8's to pick up 50Hz to 120Hz. Over all the car sounded good. It wasn't crazy loud but tonally it was pretty sweet. I'd love to have one for my home theater!-subymike