i have 4 15" memphis mojos in an 20 cu box sub up, port up tuned to 38hz and drops to 28 with no tap out. with 2 300 amp alts on my 2002 ford explorer, i have 7 memphis 1/0 wire powers and 7 grounds from front to back, 4 kinetic 2400's. i recently had 2 sundown 1500's straped at 1 and burped...