Fidelis AV which is the national distributor for Harbeth uses Tellurium Q Silver Diamond speaker cable.
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With Harbeth, you'll definitely not want warm leaning cables. Silver cables could be a possibility, but sometimes they're a bit lean. For my P3ESR, after a few iterations, I ended up sticking with Furutech cables and they're a very synergistic match. I went DIY, with the Alpha-S14 cable and terminated with Furutech rhodium banana plugs crimped with WBT sleeves. This is their alpha OCC wire, and essentially the same as the Speaker Reference III line, but smaller gauge. Not a warm cable, maybe slightly sweet through the mids (like Harbeths as well), and plenty of detail and openness. For this particular system, the price and performance was right.
Harbeth's owner and designer Alan Shaw says that you do not need anything special. Any cable of sufficient thickness for the length will be fine. He occasionally uses ordinary electricity flex for demos. I think he is right, although it helps if the two strands are colour coded or have some ridge to avoid polarity confusion. That is really all there is to it.