Finally...............I have a winner. I installed a Kicker Subwoofer in the trunk with a 1000w mono block amp and the sound is amazingt! Plus........it fits under the top with no problem. The dimensions are 16 inches long, 5 inches wide, 3 1/2 inches tall! Sorry Frank.............I just couldn't wait any longer! Total cost for this upgrade was $250. I am loving the sound!