David, if you're thinking about signal strength, it's essentially a non-issue at audio frequencies for coaxial cable(doesn't necessarily have to be the "thicker" kind; RG59 is fine)with the lengths used in home installations. Far more than what you're installing would cause no signal strength problems. Unusually severe electrical interference somewhere on the run could be a problem, but that's almost never a situation that arises in home environments.

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Enjoy the music, not the equipment.