This is the digital brute that is the cool kid of the NAD product range, actually at some odds with the original target market ethos of the NAD line up as it is a thoroughly high end piece of kit with fantastic construction...
Hi Fi News review of the M2 of the M2.
Stereophile Review of the M2.
The M2 is a solid 250 rms per with substantial headroom from a massively constructed class D style design that actually converts an Analogue input into a Digital signal and the PWM stage is fed directly with a PCM digital signal.
A few years ago I met a Wadia amp that was defence department money and ... oddly enough ... a Sharp product that were both attempts to carry out this particular digital realm amplification trick.
Finished in a two part cast alloy fascia in gunmetal and silver alloy. There are optical and coaxial digital plus RCA and balanced analogue inputs. For a full spec go here.
So what you get with an M2 (once burnt in ...) is a really assertive and full bass that underpins a very explicit and detailed midband that is terrific at vocal engagement. The top end is restrained ... perhaps a little safe in comparison to my fave Cyrus but a good match for some B&W or other product. The midrange projection is really good after 48 hours of use ...