Should I build a sealed enclosure for my hatchback firing backwards or firing upwards toward the rear glass? I was wondering if firing backwards will be louder? The subs are a pair of JL 10W7. Also if anyone know about the W7, will overpowering them by a good 200watts kill the subs? As of right now I have the subs being powered by a Rockford Power T10001BD amp which mines put out 1600 watts at 1ohms and 1100 watts at 2 ohms so its around 1400watts at 1.5ohms. Will the W7's handle an extra 200watts no problem?