Recommendation for a highly resolving amp

Another vote for changing out your cables ~ w/o spending a fortune, you could go w/Synergistic Research Foundation cabling ~ I was a bit amazed when I installed them in my system...it would be a significant upgrade, and give you at least a good chunk of that detail that you're chasing.  And I agree w/everyone else who said that the PASS Labs amp is almost certainly not your problem.Don't be an unbeliever when it comes to cables, they really do make a difference; if you have bad/cheaper cables, and you dive into the deep [but not deepest, unless your main driver is a Ferrari, or your wife is OK w/a second mortgage] end of the pool, I'm guessing it will be your last upgrade. 

You sir have some very nice equipment, just sit back .Play some music and enjoy.Your on a money spending to make my system sound better trip.

^Hearing something different and appreciating what it does, is one thing; living with it long term is another.

@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.