hello i have a 1997 ford expedition with 2 12 in rockford fosgates and 2 12 in pioneer premiere subwoofers thein in ported boxed

i have 2 2400 watt directed amps and a 1500 watt amp how can i get the loudest sound out of them for like competitions i would like to hit high 140's to mid 150's

i was thinking about making a box to put all 4 in

just any suggestions would help out alot do i need a capasitor

im just getting into the competitions maybe 4 subs isant the way to go for classes any suggestions to get the loudest in any class with 4 subs 3 amps and 2 batteries i would be in super street class

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