If the subs are dual voice coil (I would assume they are) it really depends on what amp to determine which ohm rating the subs should be. If you are going to get an amp that is stable at 1ohm, get the 4ohm subs. If your amp only goes down to 2ohms, get the 2ohm subs.
Two 4ohm subs can only be wired together at 4ohm, 1ohm, and I believe 8ohm.
Two 2 ohm subs can only be wired together at 2ohm, 0.5ohm, and I believe 4ohm.
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2014 Nissan 370z Gun Metallic 6-spd
Test Pipes | Nismo CBE | Stillen Gen3 | Swift springs | Advanation Sway Bars | RJM Clutch | GTR DBA Premium Wheels
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