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I have decided on an amp for my JL Audio XR650CSi component set. Im going to run them off a HiFonics Apollo Son of Boltar. The only thing is that I can't find anywhere in the info what AWG wire I need. The fuse rating is 60 amps so im guessing AWG, but I just need to make sure.

 
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4 guage for the distance you will be running it. I always run 0 though.

 
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I used 0 gauge. If you're gonna use the JL speakers, get the JL amp. A 300/4 is only $300 on ebay. They sound reallllly good.

 
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4 guage is fine for your needs. no reason to run 8 guage anyways, a 4 guage kit on ebay goes for $36 shipped anyways.

I think you can get a 4 guage kit at walmart that has everything you need too for abotu as much.

 
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I don't have $300 to spend on an amp, I am not competing or anything so I don't need a top of the line amp like JL, I just need one that will push these speakers by making them loud and clear.

 
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4 is more than sufficient, no need to run bigger than that for your application.