any experience w/ Wilson & Spectral?

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.

I have the Watt Puppy 7's with Spectral and they sound fabulous on classical, which is all I listen to, including season subscription at BSO. WPs are fussy in setup.

I have headr Wilson+Spectral combo on HE200x (do not remember exactly). It was deadly combination, I have never heard such powerful bass and dynamic. It was not musical though, I did not like it, I was deafen and shaken, it was opposite to the subtle, not my cup of tea.