atanarjuat99,
I owned the Sopra 2’s for quite some time and enjoyed them very much.
They have beryllium tweeters and depending upon the source many think they sound bright. I didn’t, but at that time I was using tube amps.
I used mine with no toe-in, so you could start there. Silver cable may increase the brightness in the tweeters, but make sure your cables are really burned in.
I found that silver cables are all over the map in sound quality. Silver cables made from purer silver (.9999) sound great. But that can be expensive.
ozzy

