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Hey everyone, one last question. Someone told me that when wiring my jl audio 12w3-D4, it was ok to use 12 guage to wire the sub to the back of the box. I just wanted to make sure that that is ok to do. Lastly, when wiring the back of the box to the amplifier, can I also use 12 guage wire, or do I need to use something a little bigger? When you look at the wires connecting the voice coils, they look like they are only 12 guage, so I would assume it would be ok to connect the subwoofer to the amp using 12 guage. I would really appreciate your help!

 
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12 gauge is perfect. there's no reason to use anythign thicker than you used inside the box.

 
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for speaker i wouldnt use any sizer bigger than 10 awg, 12 awg is fine