Lab: Paul Miller

An object lesson in how to create a monopoly: make something no-one else can copy. As tricky to manufacture as CD players, electric cars, digital cameras and quartz watches might have been at the outset, competitors soon emerged for each. Not so DS Audio's 'optical' cartridges, which have captivated the high-end since arriving in 2015. Imitators have yet to emerge.

Until this year, the flagship power amplifier in PS Audio's stable was the BHK Signature 300 [HFN Jul '16]. Still on sale, it bears the initials of Bascom H King, the veteran designer (Infinity, Constellation Audio and more) who was given license by the Colorado-based company to engineer a high-output monoblock amp around his favoured tube/solid-state hybrid topology. Six years on from launch, the '300 model has been relegated to second-tier status, replaced by the PerfectWave BHK M600.

It's long been said that 'diamonds are a girl's best friend' but, according to Ortofon, they also have the potential to be the number one chum of any vinyl fan. While diamonds have been used for styli for decades, few manufacturers have the skill or, indeed, the budget to implement them elsewhere. Enter the Ortofon MC Diamond – the company's new £7349 flagship low-output moving-coil that features not only a diamond stylus, but also a diamond cantilever.

There are many ways to express that emotion of delighted surprise when encountering something unexpected: everything from the archaic 'Gosh' or 'Goodness', through the more contemporary low whistle or 'Wow', or even the kind of expletive never found in these pages. Meanwhile, the Blessed Google suggests that the Danes might say 'hold da helt ferie', literally 'take a whole vacation', which I guess is somewhere close to the American 'get outta here'. But for those of us brought up on British films of the latter part of last century, perhaps the best reaction to these new DALI flagship speakers is just to mention their name, perhaps followed by 'blimey' for the full effect.