There are 7 pair wires for speakers connection ( 2 front door 1 center 2 woofer 2 rear deck).
If you use 4 channel amp then you will only be able to connect to 2 front door speakers and under seat subwoofers.
I highly recommend connecting rear deck speakers as they provide a nice boost to upper midrange.
Use at least 6-channel amp to replace stock amp.
I will skip the center channel as it is not necessary and it is a bit more challenging connecting it as the head unit only outputs 4 channels (2 Front 2 Rears) and you will need special adapter or processor unit to produce L + R signal.
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