Which Amp Should I Get, Kicker ZX850.4 or the ZX650.4

[crfrider 10+ year member]

ok im going to run all kicker products, I have a zx2500.1 and 2 15" L7S now im getting a tahoe and am going to run all kicker speakers, I want to run 2 sets of KS coxial 6.5s in the doors, 1 set of kicker Ks 6.5 comps in kick panels, 1 set of kicker ks 5.5s comps in the a-pillars and 1 set of kicker KS 6x9s in the back now i have a kenwood ddx812 deck, now the watts per speaker are 65 watts each coxial in the doors, 75 watts per 6.5 comps in the kicks, 65 watts per 5.5 comps in the pillars, a 100 watts in each 6x9, total rms if i ran all speakers on amp would be 740watts, now im debating on buying the kicker zx850.4 and powering all my speakers or just getting the zx650.4 and powering the 2 sets of comps and the 6x9s, and leaving the door coxials on the kenwood deck|? any ideas

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[mxer69 10+ year member]

you're going to need a six channel or a 4 channel + a 2 channel....