Outboard DACs

Although UK readers might not recognise the EarMen moniker, it's certainly not a newcomer to the world of hi-fi. Its back story is quite convoluted, for although EarMen is based in Chicago, it's funded by the owner of Serbia's Auris Audio, Milomir Trosic, and most products are produced in the same Serbian factory. Auris is aimed at the premium market, with products including the Euterpe and the Nirvana – both headphone amplifiers lavishly adorned in wood and even leather – plus a neat line of luxurious-looking tube amps and even some turntables on offer.

Is there really a CD revival on the horizon? Rolling Stone magazine kicked off the year bristling with optimism about the return of the Compact Disc but, behind the hype, there's little dispute that this physical format offers great lossless fidelity and costs next to nothing secondhand. Until audio hipsters cotton on to the trend, of course... Sound United, owner of the Marantz and Denon brands among others, concurs, which is why it's launching not one but two CD spinners in 2022. We're not going to talk about the entry-level Denon DCD-900NE here, but about the still very affordable £749 Marantz CD 60.

Coming from Musical Fidelity's upper-tier M6 series, the M6x is the Austrian company's priciest DAC, and the latest evolution of a product that originated around a decade ago. Of course, there has been plenty of progression through the M6 [HFN Mar '13], M6s [HFN Jan '18] and M6sR models to where we are now, both outside and in, but a few things haven't changed, including the size of the hardware, and the absence of any network streaming.

The name of this new product from Polish company HEM, selling under its Ferrum brand, is spelt ERCO, but pronounced 'ertso'. Apparently it's Esperanto for 'ore', and so follows on from the mineral-based brand-identity – Ferrum, OOR – you get the idea. What's also not immediately apparent, given that all the Ferrum products basically look the same, is that the £2395 ERCO is perhaps the most comprehensively equipped model the company has made to date.

Inundated as we are with pocket-money portable headphone amp/DACs, Chord's Mojo 2 asks the question: why drop £449 on a portable headphone DAC? Once you hear it, you'll understand, especially if top-quality sound on the move matters to you. The Mojo 2 is an upgrade on the top-drawer Mojo [HFN Jan '16], the battery-powered, smaller-than-a-deck-of-cards DAC/headphone amp. It arrives with only a £50 price increase that doesn't even correspond to real-world inflation. Even without the Mojo 2 improvements, the original Mojo should retail for £470 in 2022 just for the inflation, so Chord has somehow managed to squeeze in a host of upgrades with but a nominal price hike.

As we described in our review of AudioQuest's original JitterBug [HFN Oct '15], this little serial plug-in is not a re-clocker for digital datastreams, but rather a purely passive device (drawing no power from the USB hub) that provides transformer-isolation and RF filtering of both the 5V USB 'VBUS' and its differential data lines. The promise, according to AQ, goes something like this: 'the dual-discrete noise-dissipation circuits reduce internally generated RF noise for improved streaming audio, [reducing] jitter and packet errors'.