Hi guys, first time here. I have a Kicker ComVX 12" with a CXA600.1 and I have a small 12" box from Best Buy.. I like the sound of the subwoofer but I'm planning to build a box myself, to fit my car. My quick question is does the box base have to be big for a good response? I see normally all boxes are 14"-17 inches deep, what if I make the box wide, and tall but less depth so that the trunk still has a lot of room? Would the vibrations still go through the car? Or it would be lessons because its less contact to the car. I understand air waves will still come out of the port but how about just vibration itself? Thank you.