Benchmark AHB2 amplifier - what to expect?

The AHB2 is not class D, even if energy consumption is low.

Correct.  Did not mean to give that impression.

Mapman, that is what I suspected - newer class D amps use either Hypex or Pascal modules.

Randy, I suggested, that it is the very last moment we can buy something like that, since we're retiring in May.  I also stressed out benefit of additional amplifier to make second system (Paradigm Studio/60 v2, Benchmark DAC1, Rowland 102).  SHE SAID YES!!! and I placed the order a moment ago.  With 30 day free trial (when ordered directly from Benchmark) I don't risk anything.

Willemj, It is combination of class AB and class H, where supply voltage is modulated according to amplitude of the input signal in order to reduce wasted power.  I wouldn't mind good class D, but Benchmark AHB2 got Stereophile 2017 recommended component class A and has great reviews everywhere else (I'm already tired from reading reviews).

Thank you all.  I will post small review.

Back in April/May of last year I auditioned, with the intent to buy, the AHB2. I read pretty much every report, paper, review, etc on this piece because I was in the market for an amp --looking for a good fit with my Dynaudio Contour S3.4 LEs. My first AHB2 amp arrived and a problem developed shortly after; I connected everything up properly, turned it on, played some music, then listened for a bit then it went into protection mode. I called Benchmark and they were phenomenal with sending me out a new unit. The second unit was stable with no issues. I found the sheer resolution very remarkable; The bass was tight and tuneful. The midrange was transparent and open. It easily drove the Dyns with precise control. After some time however, the sound grew fatiguing to me, and I noticed that it did not sound all that great when played at low to medium-low volume. In the past I drove my dyns with a Pass X250.5, Plinius SA102, and I know how amazing they can sound at pretty much any level. There was just something missing about the AHB2 presentation; like the soul was sucked out and I could not connect to the music.
At this time a lightly used Bryston 4B SST2 popped and I bought it. The Bryston was heads and tails a better match. Back the AHB2 went. I kept the Bryston. The Bryston has very low distortion on paper, perhaps not as low as the AHB2, but to me its another "who cares" lesson because its all about the end synergy. It’s either there and the system has that warm, organic sparkle, or its flat and annoying. The Bryston and Dyn match was superb.
Cheers

SHE SAID YES!!! and I placed the order a moment ago. With 30 day free trial (when ordered directly from Benchmark) I don't risk anything.

Be sure to give us your impressions. I'm looking to purchase one as well. As a temporary stop gap last August, I purchased the Nuforce (class a/b) sta200 for $499 (origially $1400). I was blown away (maybe my old B&K amp was too far gone and anything was a major improvement). I still plan on a new amp early this year. 

I have a 101 db efficient speakers and the quieter, the better. I narrowed down to go tubes (QS Horn Monos) or the benchmark.