I had the 2200 amp, the earlier version without the “PE” on the faceplate. The owners manual talked about the whole “Power Envelope” circuitry which was supposed to make the amp much more powerful during transients, etc... The copy sounded convincing to my unsophisticated self, but now that I think of it, I don’t know if they addressed the amps ability (or lack of ability) to drive lower impedance loudspeakers.
I just know know that when I hooked my 2200 up to my used set of Thiel CS3.6 loudspeakers, the sound quality was harsh and fatiguing. And this was after I sent the amp to have an “audiophile upgrade” where a person replaced a bunch of capacitors. The other issue with these big NAD 2200’s, at least it was for me is transformer hum. Mine was vibrating so loudly, I could no longer enjoy quiet passages in my music. I asked around at stereo repair shops and also checked with NAD and it turns out that the transformer (power supply) for that amp was a proprietary design that housed 3 different power supplies within it and could not be rebuilt with off the shelf parts. And NAD stopped making parts for this over 30 years ago!
So, not knowing what type of impendence load a set of Aeriel Acoustics speakers require, I would tend to agree with the advice from the others who say - move on to something else”.
In hindsight, with the 2200 I had an amp that played really loud but even when new it made for a fatiguing listening experience.
