Mountain-high,
I have been using Duelund products since 2006. In that time I have tried VSF Cu, VSF Black Cu, Cast Cu, and Cast SIlver. Each time I moved up the Duelund line the sonics improved. When I finally tried the Silver Cast it was hard for me to get my head around the price.
When I finally took the leap I was well rewarded. Going from the VSF Cu to Cast Cu is a very obvious improvement. Going from a Cast Cu to a Cast Ag is as obvious.
Most associate silver with being thin or bright. My experience confirms this if it is stranded silver wire in a teflon dielectric. Duelund uses silver foil, this is why the cost is high because foil is expensive to manufacture, and it does not have any of these traits. I used Dulund silver on the LF first and the improvement was more definition in the bass, greater weight, and more speed. Notes do not hang longer than they should and have a natural decay. Going back to copper it almost seems the bass is bloated after using the silver.
I use Duelund Ag wire inside the speaker and this was a substantial upgrade. Check in with Volleyguy as I instructed him what I did and he did the same regarding the internal wiring. Our findings were almost identical.
I have Scan Speak Revelator drivers in my speakers. With the Duelund Xover and internal wiring they pair very well together. I call them the Denmark connection.
The one area that is not discussed that much is Duelund inductors. For me they are the real value in the Duelund lineup. You have not heard a black background until you try them. You will hear more ambient infomation with them in. They improve all frequencies. However, in the LF in series with the bass driver you will hear things that you never did.
The caveat with Duelund is their size. They are BIG ASS. If you are interested I have numerous Duelund caps lying around and can send a photo of them compared to a V Cap, Clarity MR, Jupiter HT, Mundorf Supreme Siler/Gold.
These caps are dwarfed next to the Duelund.