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I don't have the two 4ch amps yet, that's on my to-do list. I do have the sub and sub amp, so that's first. It'll probably go behind the radio though. They're not very big.
You can use the OEM wiring for the door amp. There's a thread or two around here about doing just that. One potential issue is power, because it draws power from the HU instead of from the battery. You may need to run your own power. That's all addressed in the other threads though. I would try using the OEM amp first; it may work just fine for your needs. It's a 2 ohm amp, so you'll be losing half your power unless you can find 2 ohm 6.5" speakers. If you do and they're not very much money, let me know.
If you're running the fronts and rears on their own amp, or running the doors on their own aftermarket amp, you'll be able to adjust the mains independently from the doors. If you want to do it nice but still maintain the OEM HU, an active crossover will be very beneficial. I'll be doing a minimal install, so I'll be making my own passive crossover network with L-pads to balance the audio. Easier to do is an aftermarket HU that provides proper fading and balancing.
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