Lab: Paul Miller

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.

How much power does your present amplifier produce? Expectations have risen over the years to the point that wattages in the three-figure range are no longer exceptional. But is this necessary? The Philips AG9016 seen here is rated at 2W per channel – not even sufficient to satisfy the fairly lax requirements of the DIN 45 500 'hi-fi' standard, which requires six watts.

For those who felt that ELAC wasn't one for adventurous industrial design, the Concentro series has proved them wrong. You'll find some very curvy and organic-looking models in this range, which rises even above the finely crafted and attractive Vela series [HFN Apr '19]. However, the Concentro range still feels more like a disparate collection rather than a real product family. Virtually every model has its own design, from the menhir-like Concentro and Concentro M to the high-heeled S 507 and S 509 floorstanders.

Bunting must surely be in short supply. Along with the Royal Jubilee, we had SME officially celebrating its 60th birthday while Nagra rolled out the cake for its 70th – and now Clearaudio has released a product to celebrate its '40 years of excellence' (an anniversary that actually fell in 2018, but product delays are nothing new). The good news is that the result is the £17,500 Clearaudio Reference Jubilee turntable; the bad news is that production is limited to 250 units worldwide.