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System building and component matching is the backbone of hi-fi. Sure, it might seem a never-ending process, each change yielding new results and then more experimentation, but it's an enjoyable one. The Legend 40.2 Silverback tested here, an active three-way floorstander with digital crossover, Analog Devices DSP and integrated DAC, bypasses a lot of that journey – and if combined with the optional wireless Stereo Hub (£400 when purchased with the speakers, £700 separately), removes the need for any cabling except a mains lead. Yet Danish manufacturer System Audio (SA) then uses the Silverback's digital architecture to offer its own take on audiophile fine-tuning, via a newly-launched range of DSP upgrades it calls 'RAM Tweaks'.

If I wasn't averse to tattoos, I'd have one that says, 'Always Read The Owner's Manual First'. I spent so much time trying to illuminate the VAC Sigma 170i's iQ warning lights that I was wondering if the review sample was a dud. Doh: in this application, the £10,000 single-chassis alternative to the Signature stack [HFN Mar '21], they don't light up at switch-on. Here they only work when something is amiss. Blast it! I never did see them in action.

Never let it be said the product name isn't long enough – in the 12 years since Naim launched its network audio all-in-one, to which the buyer need only add speakers, it's grown from the simple NaimUniti of the initial model, all the way to this, the £2399 Naim Audio Uniti Atom Headphone Edition. And yet here, less is more.

Unlike its meaning as a show of arrogance, in a design context a 'conceit' is, variously, 'an ingenious or fanciful comparison or metaphor', 'an artistic effect or device', or 'a fanciful notion'. AGD's £18,000-per-pair Gran Vivace is all three. To understand the utterly bizarre use of a valve's glass envelope as a housing for a solid-state amplifier, think of a similar conceit in another field: smart watches which, instead of emulating Apple's genre-defining rectangle, look like analogue timepieces.