Pre/Power Amplifiers

Unlike the traffic on the motorway for which this stereo amplifier is definitely not named, Canadian manufacturer NAD is rolling along at pace. The M23 auditioned here, available in just a silver finish, is its latest amp to feature high-performance Purifi Eigentakt Class D technology, following in the footsteps of the £3999 M33 BluOS-capable integrated [HFN Aug '20], the seven-channel £4499 M28 power amp, and the more affordable £1749 C 298 stereo amp [HFN Oct '21]. That NAD should have chosen to adopt Eigentakt modules for a trio of models before upgrading its flagship two-channel Masters series power amp is perhaps something of a surprise. But it proves to have been worth waiting for.

First announced in the spring of 2023, unexpected delays to the arrival of NAD's M66 have only heightened anticipation of this flagship 'streaming DAC/preamplifier' - especially among owners of the company's Eigentakt-based M23 power amplifier who have been waiting for its companion product. And, yes, while the £4499 M66 could add its wide-ranging feature set (including app control and room correction) to any power amp, the M23 makes for an aesthetically pleasing fit.

Nagra has, with the exception of the now-best-forgotten Pyramid amplifiers [HFN Feb ’05], a near-faultless track record. When you consider that the company leapt from professional tape decks to audiophile-grade valve electronics 20 years ago, the transition has been remarkable. With the second of its HD models, the HD PREAMP (joined by the HD DAC), one witnesses the completion of ‘Phase One’ of Nagra 2.0.

At times of late, it seems Salisbury's Naim Audio is wilfully courting controversy. It's been causing ripples with the brand's faithful fans ever since it launched its all-in-one Mu-so systems and second-generation Uniti products. It wasn't that these arrivals were on a mission to make hi-fi simpler for all, eschewing the tweakery and 'black magic' once suggested as a prerequisite for realising its true potential – no, what broke the usually calm surface was the fact the Naim logo, for decades lit in green, had turned white. Cue Naim aficionados fanning themselves like Edwardian grandes dames with a fit of the vapours.

The development of this completely new power amplifier has been a major undertaking for Naim. Up to now, its designs have been variants on the late Julian Vereker's founding concept, which led to the first NAP 250 stereo chassis some 25 years ago. Even now, the company's biggest current model, the NAP 135, is a monoblock variant of the '250, with more generous power supplies allocated to the separated channels.