Review and Lab: Keith Howard

If you're looking at the photos of the Aeon 2 here thinking, 'Isn't that a MrSpeakers product?', the answer is yes and no. The original Aeon was indeed made by MrSpeakers but recently the company changed its name to Dan Clark Audio, Dan Clark being the company founder. It was a sensible move because MrSpeakers had never made, or looked like making, a loudspeaker, but like all company name changes it can take time to bed in.

When we reviewed the LCD-2 [HFN Mar '13], Audeze was in the vanguard of what was to become the rebirth of isodynamic driver technology, more commonly known today as 'planar magnetic'. To those of us who'd lived through the high-profile launch of the original PM headphone, the futuristic looking Wharfedale Isodynamic, 40 years earlier, it came as a surprise.

Of late we've had some speakers through editor PM's listening room only describable as imposing, but nothing quite prepares one for the sheer visual impact of the Duo Primo XDs from Germany's Avantgarde Acoustics. Standing some 1.8m tall by 67cm wide, and weighing 185kg apiece, installing them is a matter of slotting the boxes together rather in the manner of building a PA stack – an appropriate analogy, as we'll discover – while the price-tag is similarly huge, at £79,500 a pair.

Back in the late 1970s Bob Stuart of Meridian observed that an amplifier has more inputs than those labelled as such, others being 'output' and 'mains'. It was an idea to which lip-service was widely paid but, on the mains side, nobody really picked up the idea and ran with it until PS Audio introduced its first mains regenerator in 1998. Yes, we'd had mains filters and conditioners of various types before but this was the first device that said that if you want the cleanest mains supply you're going to have to synthesise it from scratch.