Recommendation for a highly resolving amp


I have Don Sachs 2 tube preamp driving Pass Labs X350.5 driving Sound Lab M545 ESL speakers. I like the sound very much, but when I went to hear my friend’s Spectral system (driving Quad2912 ESL) I realized my system can benefit from having a higher resolution amp. Spectral amps need all Spectral preamp/cabling, which would be quite expensive. What would you recommend?
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@phcollie.    Have you compared Bryston cubed to other amps?

@mboldda1.  My friend is reluctant to move his amp as it is >60 lbs.
What makes you believe your amp is not sufficiently resolving?  Speakers, placement, room and source, IMO are far more likely culprits.  Pass Labs are excellent amps.  And for the record, i design amps yet doubt that's where you need to put your money if you want to biggest result....
Don’t know your budget, but if you are seeking detail and if your budget permits consider the Ayre Acoustics VR-Twenty. See review below. 
https://www.whathifi.com/us/reviews/ayre-acoustics-kx-r-twenty-vx-r-twenty
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