right now i have 2 l7 15's in a 5.3 cf box tuned at 34-35hz running off 2500 rms. i already have another l7 15 and a 1000watt rms amp i was thinking about buying one more 15 and another 1000 watt amp to wall off the truck. but then i got to thinking for the money and the subs not being rebuildable would i be better off or the same with to fi 18's in a wall with alittle more power