Just your standard 2 x 4m of QED 79, NACA 5, Linn K20, etc, to form a Thiele network, isn't it? I remember the designer telling us on here that he went down the "use only NVA approved" cables because he grew tired of the phone calls asking about yet another cable from China that claimed miracles.
Well you would, to be fair, wouldn't you?
Until you reposition your system and then its the wrong length !!
When I was at University many years ago, when the Wharfedale Diamond IV was current, several people had systems in the flats I was in. One chap came across to my room and said he thought he'd damaged a speaker, (aforementioned Diamond IV) and indeed one of them sounded quite dull and indistinct, and the other fine in comparison. Obvious thing to do was swap them over to see if it was the amp, and when swapped over the dull and miserable sounding speaker perked right up and the previous good was wasn't any more.
Not the the speakers then.
Was it the amp?
Looking down the back, I saw he had about 0.5m of his speaker cable on the "good speaker" and all the rest of the cable on the other one. I went and got my speaker cable and a low and behold both speakers now sounded better than either had before (if a little bright now, I thought), but more importantly they sounded the same.
He hadn't wanted to waste any cable when he bought the system, he'd cut a bit off for the speaker sat next to the amp, about 0.5m and left the rest on the other, that length was at least 8m, probably 9.5m. To add insult to injury he'd coiled it up but uncoiling it brought only a marginal improvement. He only needed about 3 m so cut it down, balanced up the lengths roughly and never worried about it. He was using QED 79 strand. I was running the light blue jacketed and very flexible Supra 4 (if anyone remembers it) in 3 meter lengths.
I learnt that anything over 1.5m was the wrong length for QED 79 strand. Avoided it ever since.