Dewayne, one suggestion I'd have is to only set the 797 to 4 ohms as a last resort, i.e. if it keeps shutting down. As Alan pointed out, receivers which have a 4 ohm switch or menu setting have reduced maximum power at that setting, since what it does is to reduce the maximum voltage, and therefore power, available. The 797 is a pretty sturdy unit and I suspect that there won't be a problem, but I don't have any specific info on the matter.

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Enjoy the music, not the equipment.