I am building separate boxes for my 2 Kicker Solo-Baric L5 12"s. I want to conserve as much space as I can in my trunk. I want to put one sub on the left side of my trunk and the other on the right side. I am hoping to shape the boxes so that each runs long, but is very thin. In other words, I want each box basically the shape of a box used in trucks. There won't be much space inside the box behind the sub, and most of the space will be to its sides. Does the performance of the sub decrease as the box is more rectangular, as opposed to a square-shaped box? Thanks for your help.