Duelund hook up wires in a Sonus Faber Cremonas speakers??

I would use the 16ga and have. Great results.  

Gannyring...All at 16ga or should i do the tweeter at 20ga, mids at 16ga and woofers at 12ga.  What's your take on this?. Do you recommend stranded or solid core copper?

Duelund stranded, tinned, in oil impregnated cotton as sold at Parts Connextion. Great on highs and mids. I think it is also great on the woofers. I don't like the 20ga as much on the highs and mids and like the slightly fuller and warmer sound of the 16ga. 

The 12ga would also be great on the woofers.

Agree w/grannyring - for me the sound is more cohesive when they are all the same, but not everyone agrees.