NACA 5 optimal length

This is an old story. NAC A5 length has little or nothing to do with sound quality. It has to do with the correct inductance or capacitance 'seen' by the older, and now perhaps the costlier, power amps, which had no Zobel network on the output stage and, so, the type and length of the cable was actually 'designed' into the amp's specifications. The risk - never witnessed by anyone, so far, thus still belonging to the realm of urban legends - was that using high-capacitance, 'special' cables, the amp could 'oscillate' at very high frequencies.

I don't think you have anything to worry about with any length between 2 and 10 mt; Naim says that over 20 mt one could detect a mild loss at 20 Khz.

Hope it helps.
Max

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NACA 5 optimal length