Wilson's are just picky speakers. Picky about the room, placement within, cables, electronics, source material.
All that said, I LOVE my WP 6's. I have the new 7 tweeters in them which help. I use mostly vinyl and BAT tube pre's and amps. Purist and Transparent cable.
You'll just have to experiment some. Different rooms will cause the speaker to sound different and cause you to select different electronics.
Re: the ARC pre and spectral amps. I'd stick with one of the other. Either go all Spectral or stick with tubes.
This is just a personal opinion and not based on listening.
All that said, I LOVE my WP 6's. I have the new 7 tweeters in them which help. I use mostly vinyl and BAT tube pre's and amps. Purist and Transparent cable.
You'll just have to experiment some. Different rooms will cause the speaker to sound different and cause you to select different electronics.
Re: the ARC pre and spectral amps. I'd stick with one of the other. Either go all Spectral or stick with tubes.
This is just a personal opinion and not based on listening.