For the price they aren't that bad. Over my spring break we put 4 12"s of these in a yukon xl and it was fairly loud. Then my buddy decided to buy to of them and we put 2 15"s in my truck. For what they cost, I'm impressed. They get loud and low. The box is about 8.25 cubes tuned at 35 hz. What do yall think about the Q Powers?