I see from the responses that the overall assumption is that different wire will make the speaker perform (sound) different?
With different wires having different LCR values, there's no reason to believe that there wouldn't be
some effect on the sound. But I agree that having customers supply their own wire, both legitimate and voodoo, opens a can of worms and facilitates inconsistency.
At the very most, I would possibly offer
one Special Edition (SE) model with a set-in-stone package of upgrades selected and tested by Bryston, much like Dynaudio and some other manufacturers sometimes do.
Perhaps WBT NextGen binding posts, a
legitimate wire upgrade and maybe an upgrade in crossover bypass capacitors of the same brand but one level up in the series. No substitutions. And of course customers would need to spend a disproportionate amount of money for perhaps a few percent better performance.
Of course you could be constantly inundated with absurd qualitative inquiries like "James, how much better sound will I get with the SE model? 4.7%, 9.4%, 13.1%?"
But I have to wonder if even I might be seduced with a Bryston Mini T SE model, with its sexy WBT binding posts (of course it would probably have to be one of the insulated models for European certification which are not quite as sexy looking as the bare ones) and a few other hidden upgrades for + $600?
Steve