I have a subwoofer box with a pair of GS Designs GS12S 4 ohm 550watt speakers. The box is just too large, (but maybe not, I am no expert). I have found web sites with the info to build new sub boxes, but they ask for manufacturers specs, I have no idea where to get these, maybe I really don't need them. They are 12" subs, 6" deep, front to back of the magnet. I am no audiophile, just want something nice to listen to. I am pretty much a classic rocker. This box I have barely fits under the rear speakers in the trunk, and I have a big trunk ('94 LeSabre). I think that because it is pretty much wedged under the rear speaker magnets, that my rear speakers are not performing as they could be, and the box is large, and very heavy. Any help, or input would be appreciated. Thanks in advance, and everyone, stay safe and have a great day.