If wired correctly and tuned right, overheating should not be an issue with the 700.5. What Sub? the 700.5 class D sub chnl will deliver 210W's rms @ 4ohms for the Comp-10 4ohm, and 420W's rms @ 2ohms for the CompVR-10 4ohm DVC. The CompVR-10 is a better sub for a boat. The 700.5 will leave the pair of Infinity's a little under powered, but should be ok. Not sure of your budget, but a 2 amp set up may be better, 1 for towers, 1 for cabin and sub. Have you looked at the Kicker KTM'6 tower speakers? for what the Infinity's look to cost, you could get a pair of the KTM6's and a proper amp.
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