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?
128x128chungjh
@chungjh How are you streaming to your X1? Does Lumin provide a client? 

If you want to chase after more amps. I recently bought the LSA Voyager 350 GAN and had it modified ($500) by EVS and it was almost as clear and detailed as the AHB2 (maybe the same actually). In stock form it was not in the AHB2 class. However, the Voyager has a lot more power than the AHB2 and drove my Thiel CS3.7 easily. I sold it because I kept the CODA #8 which had a bit more bass but was not as detailed.

I still think your room is the issue and you can get the improvement you seek with the DSP approach. It is a much cheaper way to try instead of buying new gear.

BTW - @lancelock has the CODA #16 and just bought a CODA 07x which he may post his thoughts on.
@yyzsantabarbara,  X1 is directly connected to the ethernet/modem. X1 does not take wifi. Looking back, I don't think I was very clear with my intent. As many of you mentioned Pass/Don Sach are very high quality instruments and I agree. In fact it sounds VERY good-as good as my local dealer's set up with ARC Ref 6/ARC Ref 160S. But, I still feel I can better hear the "peach fuzz" and realism in music with my friend's system.
Let me get this straight. You’ve got a Pass amp and yet you don’t find it resolves enough? There’s nothing worse in this hobby than trying to throw money at an issue that can otherwise be fixed. Your buddies sound is unique to his room. First, what are you using for room treatments? Begin there. 
@chungjh I knew that was how you had connected the X1 but how are you streaming. What is the software client that you use to play music on the connected X1. Knowing this can open up some options.