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I have 4 12s in a custom built box and have two amps I have both amps set the same way and all why do 2 of my 12s hit harder than the other 2 

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Could you provide info on how you're wired, how gains are set, and what you've checked so far?

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Your box could have loading issues , one of the pairs are wired incorrectly or it could be an amp gain problem


Walled Police Interceptor

Four 15s

160s

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I got 2 Rockford fosgate 1200.1d the 4 12s are dual 4ohm sub both set are wired down to 1 ohm and how the box made the port is on the side at the bottom 

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RCAs can go bad are you running the RCA pass thru one amp into the other or splitting before. Process of elimination maybe try one amp at a time then switch which pairs of speakers are connected to what amp.Will determine if its a RCA signal issue, amp issue or wiring.


Walled Police Interceptor

Four 15s

160s

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How did you gain match ? That’s probably the issue


My Daily 8th gen Civic Coupe

https://www.stevemeadedesigns.com/board/topic/211131-honda-civic-coupe-08-2k-daily-headaches/ (Build Log)

Gear (specifics on build log)

Pioneer 80 PRS / RF P600x4 / DC 2k / Mechman 240 A / XS D3400 + D5100R / Two SA-12(D4) / RF T2 Components / Sky High Wiring (OFC)

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Get a multi meter and start checking and double checking.

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