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I actually have 2 power wires coming off my battery. One is 8awg for my P-200 and I have a 4awg for my P-500. The same goes for the grounds. I have a 40 amp fuse on the 200 and a 100 on the 500. As far as my crossovers, I'm using the ones that are on the amps.
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Wonderful. So you aren't getting a voltage drop. You can verify with a meter, connected AT the amps, but I think you are OK with that setup.
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The thing that confusing me is if I have a voltage drop when my subs are getting pushed fairly hard, wouldn't my lights dim? If it were a voltage drop, wouldn't hooking up a 1 farad cap fix that problem?
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Nope. a 1 farad cap actually compounds the problem. You need to recharge the cap, further pulling down the system. To actually fix a voltage drop like that the way is with a filter, with a big ole coil and small cap combo. It requires some engineering, but the best fix is to solve the cause of the voltage drop. i.e. upgrade wiring, increase battery capacity, upgrade alternator, etc. You don't need to do this, its already done.
Quite possible you get a ground loop going when power draw is heavy. Try running a heavy gauge from the head unit to the neg on the battery too. Just a thought there, since your head unit gets ground through the dash, which is generally pretty poor.
You do have the high-pass on the non-subwoofers going right? so you aren't sending bass to your door and dash speakers? Just checking.