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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Chord’s Ultima line is very resolving. They have also addressed historic brightness issues and these are more neutral than the old CM line. They also deliver big power, run cool and don’t take forever to sound good.

I would also look at Boulder and Constellation.  I sell Chord and am very familiar with their line.  I have no affiliation with Boulder or Constellation.