Except even they sell two different speaker cables with very different specs. 3.5 min. will result in different values for either. And supposedly 7-10 sounds best, not 3.5 at least in the case of NAC A5. So it’s certainly not exact, there’s a range, and many different cables could meet those requirements. If they were known of course.
I asked Google, because I was to lazy to pop downstairs to measure my own cable, and lo and behold found a post on this site! Funny how internet search is often better at finding posts on the forum than the forum’s own search.
In the past, I’ve always consider speaker cables a separate part. With Naim, I consider the speaker cable as an integral extension of a Nait or Nap. Thus I have a Naca5 (coz I can’t afford a Super Lumina ).