For a 13ft x 2 run for that 2 chnl and 4 chnl amp, the 1/0 ga is fine for the trunk line and then 4 ga to both amp from the distribution block. Besides, I dont think that amp will accept 1/0 ga in the lugs.
Have you considered selling the 6.5" HLCD and go with a single pair of larger HLCD? This would give you what you are after by adding a set of coaxials, and the amp would run at a more comfortable 4 ohm p/chnl.
14ga if you are going to home-run each speaker wire run, or 12 ga down the tower to the amp, if you are going to make the parallel junction up in the tower.
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