Some break in time silver cables does reduce the brightness. I noticed it more when I added Goertz Micro Purl silver interconnects than when I added a set of Light Star Audio silver speaker cables. After about 200 hours they sound wonderful together. The silver does give better detail and soundstaging in my system compaired to copper. Good luck.
Does silver speaker wire sound bright?
I purchased a kit of 99.999% pure silver speaker wire with PTFE insulation and assembled it. I installed it on my system and it seems to scream at me. My system is all tube (Melos)and my speakers are the North Creek Rhythm. I use the preamp also as a headphone amp and use Grado SR325's. The headphones are not bright they lean tward a little dark sounding. I feel the brightness is in the cables and wounder if they will mellow with age, and how long will it take?