How long can an RCA cable be before it loses quality?
Composite RCA – 100 feet (regular); 250 feet (with extender)
Being analog, the image quality can degrade at longer lengths but the loss is not noticeable at 100′ or shorter. It is possible to go up to 300′ with a regular cable, but the quality level will vary.
Do audio cables wear out?
Cables don’t “wear out” in the same way that some components, such as vacuum tubes, do. In most cases, unless it is damaged or suffers wear from being coiled/uncoiled, stepped on, pulled, twisted, bent, or otherwise abused, a cable will continue to perform just as it did when you purchased it.