internal speaker wiring

[Diabolical Artificer]

"I am certain that these speakers (its the Mission 770s) have been fitted with external cable" Probably. I had some 770's the older sort and have some 720's, the latter being Mission's top of the range speakers, they have wire about 1.5mm (total diameter)as Trev says. Think about it, there is high current going to the woofers but as Trev says, over a short distance. Wires to tweeters don't need to be thick, again, a tweeter needs hardly any current. If you've ever taken a speaker voice coil apart this will give you a hint.

I'd use some decent stranded copper wire, about 0.5 - 1mm copper diameter, I've got some if you want a yard chucking in the post.

Andy.