Purchased one 3 weeks ago. Has been hooked up on the rear channels of a qx300.4 bridged rear channels for two weeks for break in. So far sounds very good. I am impressed with the build quality. It is a beast. It's mounted in a cheap ebay box under the rear seats of a '98 Chevrolet Silverado ext. cab. Will update once it's powered by a xenon 600.1. Waynehead has seen/heard the woofer as well for further questions. Great for limited mounting space and limited depth in front of woofer. Has inverted surround.