Summary: I bought one of these and put it in the back of my wife's Yukon XL. Could barely tell the difference in bass fill with it. The two adjustment knobs were about to break and the connector bracket was bending from the weight of the ground and power wire. So I sent it back to Amazon.
Summary: Easy bass in the back. For a little over a hundred bucks I got a 400 watt powered 12 inch sub woofer that has a built int amp. It just slid in behind the seat in my truck connect some wires and boom!!! I got some kicking bass in the back. I'm gonna get another one for the other side next week.