Hi, I don't think 15th is so long...(40, 50, 100 yes...) You should be ok...maybe elevate them if on carpet, be careful around AC cords...
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FWIW, I am having some 20' ICs to connect my preamp to my amp custom made for me as I type. Before I placed the order, however, I checked with the manufacturer of the preamp (McIntosh). I was told a run that length of RCA ICs would be no problem for my preamp, but that with some preamps, this can be an issue.
Make sure whatever you buy is well-shielded against RF interference.