Headphones

Among those fortunate enough to have experienced it, the AKG K1000 is often spoken of with a mixture of reverence and awe. It wasn't just AKG's flagship when introduced 30 years ago, it was an attempt to redefine headphone design and shove it in a new direction. The K1000 had no earpads as such – its capsules were held away from the head by small pads above the ears – and it was pared-down structurally to obviate other resonant cavities and minimise the reflective surface area.

Astute readers will have noticed that we've been exploring the HiFiMan range in stepwise fashion. We began with the £475 Sundara [HFN Jun '19], progressed to the £1500 Arya [HFN Aug '19] and have now reached the £5750 Susvara. While, despite its elevated price tag, the Susvara isn't the most expensive headphone the Chinese manufacturer currently offers, the costlier Shangri-La and Shangri-La Jr are both electrostatic models, making the Susvara its flagship planar magnetic design.

As one approaches gear at lower price points, every pound matters that much more. It's simply a fact of life: the customer for Auris Audio's Nirvana high-end headphone amp [HFN Jun '19], at £4900, might be cavalier about issues such as value-for-money, features, finish or other details. Not so the prospective client for Auris Audio's £1499 Euterpe, because the market is over-burdened with serious competitors and money is more of a determinant.

With 16 current models in its Reference range, HiFiMan's product offering many not be as extensive or potentially confusing as Audio-Technica's but still it's a lot to get your head around. I classify them, informally, into round capsule and ovoid capsule models, the £1500 Arya being one of the latter. It's an apt classification in that once you've worn the Arya – or any other headphone whose capsules better reflect the shape of the external ear – you wonder why headphones aren't all designed this way. You wouldn't wear rectangular shoes, so why are these shapes so widely used for headphone capsules and earpads? It flies in the face of anatomical logic.

We've reached the stage in the renaissance of the planar magnetic (aka isodynamic) headphone where merely being one is no longer worth more than a passing mention. In fact it's a few months since I've had anything but PM headphones arrive for review. So to be more than the PM headphone du jour, any new model needs something extra: a true USP.

Having followed Auris Audio from show to show since its 2013 founding, I leapt at the chance to review its stylish Nirvana two-chassis headphone amplifier. I'm no longer shocked by the cost of high-end headphone amps, especially not at a time when £3000 headphones are common, so its £4900 price tag earned a mere 'Meh' from me. After all, I'd be putting it through its paces with, among others, the Audeze LCD-4Z, which sells for £3600.

Although it received a lukewarm review in these pages [HFN Dec '13], the M4U 2 – predecessor to the M4U 8 we're looking at here and still available – proved to be a success for PSB, garnering plaudits and awards along the way. The M4U 8 looks very similar and it would be easy to suppose that it's just an M4U 2 with wireless capability in the form of Bluetooth and NFC (near-field communication) bolted on. In fact it's a bit more than that, principally because its onboard DSP capability allows it, in active mode, to deliver a more precise adherence to PSB's RoomFeel target frequency response.