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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My friend uses his Spectrals to drive Quad ESLs and it sounds great. Would Soundlab ESL be that different than Quad?
Depending on the Quads, yes.
@jdane, by resolution I mean clarity and realism. Like ultra high definition TV vs regular HD TV.
Thanks.  Seems that a number of these terms are being used here simply as variations of "good."   I don't see any clear distinction among them.


Maybe, just maybe your excellent amp needs a tune up. The .8 series is 8 or 9 years old, the .5's obviously older. Nelson is as good as they get. I would still have my 250.5 if I had room.
I will be receiving Benchmark AHB2 amps in 1-2 weeks and do a comparison with X350.5. I have to say, the X350.5 sound is gorgeous and luscious.
You will hate the AHB2 if you love the luscious sound of the PASS. You will have more details for sure out of the silent AHB2 but not luscious,