my friend has 4 memphis M312's dual voice coil unsure of what ohm. but there in the worst not even sealed box and 2 12's to each set of airspace. all 4 are run by supposedly 1 memphis 1000.1 amp but it has 2 channels. and its really small. these things should be insane but they hardly even hit at all. he has a ford f150 harley i think its like the body style of the 1999 ones. he has a custom box that made a hole from his cab to his bed. its a pretty big hole but the rubber sealing stuff is falling apart. any recomendations? i'll take pics later today