I had used the earlier Spx speaker cables before I replaced them with the Lexus LX. From midrange and up, the Spx out-performs the Lexus by a fair margin. The vocals are also smoother with the Spx. The sound is just so transparent and elegant. In fact, I regret to have changed them actually. But on the other hand, I need to change them because I am about to change my Audio NOte Quest Silver Monoblock to a brand new solid state power amp. I think the silver cables work extremely well if you have a SET amps whereas the copper cables mate better with SS amps. Hope this helps.
Best Regards
Peter
Best Regards
Peter