A while ago I posted that my 5.25" components weren't bassy enough. In fact, my stock speakers sounded better and I've even running these off an aftermarket 4-channel amp. I tried everything everyone suggested to fix the problem, specifically the lack of bass. I put insulation in my door panels, made stronger baffles for the speakers, etc. However, I still don't have optimum sound. Does anyone think adding one 12" sub to the setup will clear the problems? It'd be a 400 watt rms Rockford sub powered by a 400 rms amp. Or should I just get some 6X8" speakers and ditch the 5.25's?