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Take a quick look at the £4995 McIntosh MCD85, and you'd probably think it was another in the seemingly endless line of amplifier variations emerging from the Binghamton factory in upstate New York. In fact, the first sign that this isn't actually a power amp is the weight. Thanks to their hefty transformers and solidity of build, the company's powerhouses tend to be back-achingly heavy, and arrive on pallets – the new MA1200 integrated amp, for example, weighs in at a shade under 49kg, and the MC901 monoblock is getting on for twice that. By contrast, the MCD85 is a manageable 12.5kg boxed, and a positively featherweight 9.3kg in the buff.

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.