2005 ford mustang, 2 JL 12W7s, will give up most of trunk including spare, may add a third JL. Big 3, reqound alternator, gelcap or batcap.. Something in the order of 3 to 4KW of power, daily music, need ultra flat response from 30 to 70/80 for SQL... 4 way active, all Hybrid Audio Legatia up front (L8/L4/L1V2) Clarion DRZ9255 HU, setup for serious SQL, incrementally adjustable delays, crossover points and slopes. Not sure if I will be running 2 or 3 JLs, have a pair, looking to add a 3rd, also looking for an amp to power them... At the risk of seeming selfish, could you design a box for two and an additional for 3? Like to keep my options open... If not, then please design one for the pair of JLs.. Much appreciated..