I have had long runs of interconnects (5 - 7 meters) both balanced and unbalanced for two decades now with really no issues. Presently, my RCA (unbalanced) interconnects are Audio-Envy and work very well, noise-free and are very articulate, while reasonably priced. They are low capacitance cables. The longer your runs, the more capacitance in the cables may have some attenuation in the treble range.