Been there & have the tee shirt.
With F connections, not jumpers, with my speakers, it makes no difference.
Testing expectations, imagination & other self inflicted kidology runs riot, but cold light of day … no difference.
But if you do end up preferring one way over the other, OK, go with it.
Peder, if you want to insult the forum, go ahead, but you might loose a few friends. It might be that Sweden follows the rest of the flock, it might be that the Naim forum people are something else, but maybe best that you don’t judge.
And repeating that “Attention to Detail” mantra has become very tiresome.
My post relates to my speakers, they are unique in that I made them to my own design, you don’t know how I have them wired or what I have inside them, so how can you possibly make a judgement.
I spent a lot of time over the various connection methods & concluded although there was a difference, it was small & the question of ‘better’ was purely subjective.
If you are referring here to your reference to a Cusco switch, any effect will depend on your network, and the environment it is in, the equipment it is feeding, as well as the system then played through, room and ears. It is entirely possible that effects of something in one person’s network may be different in another network.
As for effects of which way the speaker terminals are connected, A, B and C in the OP’s case, provided that the connections are well made, if there is any difference it will be very small, and my expectation is that it would require a very analytical system and very analytical listening for it to be apparent.
But to the OP, it is so simple to try all three, you can simply decide for yourself, and if no difference leave in the way that lets the cables run best.
Depends on the speakers and your preference. Tried all 3 many times for months and settled with A. My criteria is a full and balanced bass and A gives me that. Folks who favour less bass may prefer the other 2 connections.