Maximum detail and resolution = Benchmark AHB2. I was hoping to use them with my Yamaha NS5000 speaker. However, there was a tiny bit of hardness on top that made me look at other options. My system is neutral with only a bit of warmth from my Holo Serene preamp. So, with a warmer DAC or preamp the AHB2 may have worked. I have used the AHB2 with many systems but the NS5000 is the best I have owned, and it showed some deficiencies in the AHB2.
I now use the CODA #16 with these speakers, and it has almost the same amount of detail and resolution as the AHB2 but with a lot of Class A smoothness. There is no hardness on top. I love this amp, and I cannot get myself to sell it, since I would regret it. The new CODA S5.5 maybe a good option for less demanding speakers. I also think the new CODA System 100 (I think) at $30kish could be a killer amp.
I am looking for another amp to use with both the NS5000 and my office speaker, the Magnepan LRS+. I demoed the new SimAudio North Collection 761 which was a detail and resolution champ. It may have been as detailed as the AHB2. I loved the amp, Though I did have a bit of fatigue. I attributed that to the Paradigm Persona 9H speakers, which has a Beryllium tweeter and mid. I think the not bright and very revealing Zylon drivers on my NS5000 would sound amazing with the SimAudio 761.
I also demoed the Luxman M10x amp and remembered how much I loved the older Luxman m900u. I think the M10x is more detailed and better for my needs than the m900u. I think the CODA #16 and the Luxman M10x are rather close in sound. This makes me think the 761 maybe what I get, but that Luxman really gets me into a good place.
Decisions, decisions. Luckily, I am broke for now.