I don’t think Naim sees this as a problem.
But to your point regarding the tolerances being made known I agree.
A bit we know/can deduce I guess. Electrical specs of NAC A5 are known, and Naim specify minimum and maximum lenghts.
So we know:
- 3.5uH
- 48pF is okay
- 17.5 mOhm is fine
Max lenght is 20m:
- 20uH
- 320pF
- 100 mOhm
So we have a range that’s known to be safe:
- 3.5 - 20uH
- 48 - 320pF
- 17.5 - 100 mOhm
It’s public knowledge that the minimum is because of the inductance, so we know 3.5uH is the absolute minimum. And I’m willing to bet that the maximum is mostly limited by the resistance, so max 100 mOhm. I guess not really Naim specific I guess and also depended on speakers. I guess capacitance could also be an issue there.
Now the interesting thing is that Superlumina has very different specs, yet I haven’t found any recommendations from Naim regarding its use. Or a recommendation not to use it with certain amps. That’s sold in lengths between 3 and 9 meter, so that would get you:
- 2.22 - 6.66 uH
- 199.2 - 597.6 pF
- 28.8 - 86.4 mOhm
So would it then be reasonable to combine the above into these safe (?) ranges?
- 2.22 - 20 uH
- 48 - 597.6 pF
- 28.8 - 100 mOhm