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Wank factor usually. And very rarely to reduce headlight dimming.Ground block and power block?
And whats the point of the capacitor? Dont tell me why or why not to have one, just tell me what the point of having one in a car stereo is.
Just run two power cables from the battery, one to each amp. Then a ground wire off each amp to a solid metal part of the car, the remote wire comes from the head-unit and just split it into 2 wires, then connect them to each amp.
RCAs - You'll have to let us know how you wanna run the speakers/subwoofer. For example run the 2 speakers off the 4ch amplifier and the subwoofer off the 2ch amplifier.
You can just "add on" another wire from the remote cable that comes out of your head-unit.
A simple way to explain how to split the remote is just to connect it to the first amp, then run another cable from the REM terminal of the first amp and conenct it to the second amp.