World Exclusive -- Meridian Audio Explorer USB DAC/Headphone Amplifier (Hi-Fi+)

Digital-to-analog converters,
Headphone amps and amp/DACs
Meridian Explorer,
Meridian Explorer DAC/headphone amplifier
World Exclusive -- Meridian Audio Explorer USB DAC/Headphone Amplifier (Hi-Fi+)

In the grand scheme of all things digital in our world, Meridian Audio has long been at the forefront. Back when CD first appeared, it was the first brand to realise its high-end potential. It created the algorithms behind lossless packing that helped define DVD and Blu-ray audio. When the migration to hard disk began, it was there with Sooloos (now simply called, Meridan Digital Media Systems). But the portable audio world escaped Meridian Audio… until now.

Called the Explorer, the new USB powered device is as simple as it is elegant. Meridian has managed to use the extruded metal casework seen in its top-end 800 series devices, making clean rounded lines and a surprisingly weighty feel; unfashionable as this comparison might be, it’s about the size and shape of a Bic disposable lighter, but with the weight and feel of a Ronson. The curved black plastic end pieces have the mini USB connector at one end and two mini-jack sized sockets at the other; the left-most is a combined Toslink S/PDIF and line level output, while the rightmost is a headphone mini-jack. The optical digital output might seem odd, given the prime use of the Explorer is to convert digital to analogue, but the DAC acts both as master clock to reclock the digital output, and downconverts any 192kHz datastreams to 96kHz to keep the signal within Toslink limits.

Internally, the slim PCB is every bit the audiophile product.  Asynchronous USB input is handled by the popular XMOS L1 chip, the Class 2 USB input itself being all-but-completely galvanically isolated from the rest of the circuit via a six-layer PCB, the audio-grade resistors, capacitors and even the discrete clocks are all of the standard used by Meridian’s 800 series, and it uses a PCM 5102 DAC, capable of running at 24bit, 192kHz precision. Although known as a ‘digital’ brand, Meridian’s strengths here are in the “… to analogue”  part, with a linear regulator chip and many of the sections of the output stage being made up of discrete components. And this makes itself very present in the sound quality.

Because it’s a native Class Two USB device, PC users will need to download the appropriate USB driver software, but instructions are supplied in the natty presentation case the Explorer comes in (there’s also a short USB lead and a little velvet carry bag). The Class Two software is preinstalled on Macs, so you are good to go almost immediately. Although it leaves the line and digital pass untouched, the computer’s on-board volume control drives the output of the headphones.

The DAC has three little white LEDs along its top to denote what sort of file size the listener is using: one light, 44.1/48kHz, two lights 88/96kHz, three 176.4/192kHz. When it comes to LEDs, ‘white’ is the new ‘blue’!

In listening, this is every inch (well, both of them) a Meridian product in the sound quality stakes. It’s easy sometimes to dismiss USB audio products from companies like Meridian as being ‘just for portable use’. While this is an excellent portable device running off headphones, it’s also a fine DAC in its own right. For the record, I used Focal Spirit Ones and Sony MDR-7506 headphones to excellent effect in the former case and plugged it into a Naim SuperNait and ProAc Studio 140s, using a long Vertere D-Fi mini-jack to two phono lead for the latter.

Principally, the DAC has a very satisfying presentation, with a rich and detailed midband, extending up to a clean and unfatiguing treble and down to a controlled and rich bass. This applied equally to both headphone and system, but especially to the headphone input. A perfect example of this was when listening to The Belcea String Quartet playing Dutilleux’ Ansi Le Nuit (EMI Classics). This modern quartet piece places a delicate balance on the listener, between understanding the composition and not having it sound like the soundtrack of a 1970s Eastern European cartoon about tractors. The Explorer brought the music to life, and kept the Stasi at bay. A perhaps more sane example is Superstition by Stevie Wonder on Talking Book. Wonder’s sensational drum introduction to this classic track is a bell-weather to performance; if it sounds like a standard four-beat rhythm – or like mad chaos on the hi-hat – something’s wrong, and it’s usually wrong. This time… perfect. The complexity of the rhythm is all there, but it’s not laid out like a science project. It’s still very, very funky.

I ended with a quick spot of comparison, to the excellent, if more squared off, HRT microStreamer, which performs almost identical functions. In great fairness, the two are very close, and the differences are more horse-trading than one being dominant. In comparison, playing ‘Trouble’ by Ray LaMontagne, the HRT had a more precise and clearer bass line, while the Meridian was better at bringing out the sweetness and sonority of his voice. The former made me want to nod my head along to the music more, but the latter better brought out the emotion dripping from his voice and backing. There really isn’t much in it, but I found myself returning to the Meridian slightly more as a result of that richness of tone. But the great thing about both is they are ‘locally grown’; the Meridian designed and built on my side of the Atlantic, while the HRT can proudly run up the Stars and Stripes.

The Explorer does several things. It’s made in the UK, reinforcing the concept that not everything at this kind of price must be made in the Far East. It’s absolutely a Meridian product, in build, outlook and performance, and as such it potentially welcomes new blood into the world of top-quality audio. It also answers the question of what Meridian owners do for sound quality when they aren’t sitting in front of their main Meridian system (don’t discount this, Meridian Audio’s customer base is one of the most loyal out there). And best of all, it sounds excellent.


Explorer USB DAC/Headphone Amplifier:

  • 24bit/192kHz native conversion capability
  • Separate low-jitter crystal oscillators for 44k1 and 48k based sample rates
  • Asynchronous data transfer
  • 6 layer PCB
  • USB2 mini B socket – Plug and Play with MAC (Windows driver available)
  • Direct-coupled outputs
  • Variable line out – Full Analogue Volume Control for headphones or powered loudspeakers
  • Headphone amp
  • Fixed line out – 3.5mm connects directly to audio system
  • Optical digital output – full resolution for receivers or DACS (up to 96kHz)
  • Elegant metal case – durable and increases audio performance
  • Lights to indicate incoming sample rate
  • Soft convenient USB cable provided for ease of placement to protect computer mother board from mechanical stress
  • Hand assembled at Meridian’s UK headquarters
  • UK Price (SRP) £249.00 incl. VAT
  • US Price $299

Meridian Audio

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