I just ordered new speakers for my 2 door JK. Kicker 40CS654 6-1/2" 2-way car speakers at Crutchfield.com. One of the reviewers who has a JKU said they added this powered subwoofer for added bass. http://www.crutchfield.com/p_777B8PTD/Sound-Ordnance-B-8PTD.html. I figured I would wait to install the speakers and see how they sound before I even thought about the subwoofer. Any thoughts on this item?