Meridian Audio Explorer2 USB DAC review: An inexpensive path to high-resolution audio

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Meridian’s Explorer2 portable digital-to-audio converter can play virtually any type of high-resolution audio file, but its most compelling feature is its ability to decode MQA files.

For me, MQA (Master Quality Authenticated) was the best thing to come out of CES 2015. Developed by Meridian Audio, a company with a long track record developing high-resolution audio technology, MQA makes it possible for consumers to hear music that’s not only better than CD quality, but the same quality that the artist heard when they recorded it in the studio. And the artist can attest to that because MQA files include a digital fingerprint that indicates the artist, recording engineer, or producer has verified that what you’re hearing was sourced from the studio master.

What’s even better is that the MQA files come in small packages that are easy to stream. You’ll need hardware that’s capable of decoding MQA to benefit from it, though, and the Explorer2 is one of the least-expensive devices available (Amazon is selling it for $199). The Explorer2 plugs into your computer’s USB port using the provided, but somewhat archaic, USB mini (not micro) cable. Windows users will need to install a driver.

Explorer2 outputs Michael Brown

The line-level output (left) has a rubber plug in it so you don’t mistakenly plug your headphones into it.

Most people will use this DAC with headphones, which is how I reviewed it, but it can also be paired with an outboard preamp. It has two 3.5mm analog outputs: There’s a variable-level output for use with headphones, and a second fixed-level output for use with outboard equipment. There’s a rubber plug in the second output so that you don’t inadvertently plug your headphones into it.

The Explorer2 has no volume control of its own, so you’ll need to use your computer (or an app running on your computer, or an outboard amp) to do that. I listened to the Explorer2 with a wide variety of headphones, including Blue Microphones’ Mo-Fi, Bowers & Wilkins P5, and Ultrasone ProLine 750 headphones, as well as a pair of custom-fit JH Audio JH13 Pro in-ear monitors.

I tested the DAC with a desktop PC running Windows 10 as well as an iMac. I listened to various high-resolution audio tracks (24-bit/48kHz and 24-bit/96kHz FLAC files) as well as numerous tracks encoded with MQA, both downloaded and streamed from Tidal. (You need to subscribe to the HiFi service level at $19.99 per month and use Tidal’s desktop app to listen to MQA streams. Tidal’s web and mobile apps can’t currently stream MQA tracks.) Tidal also offers FLAC-encoded versions of MQA-encoded albums, which made it easier for me to conduct A/B listening tests.

Listening tests

The biggest downside of any new format is having to re-buy all your favorite music to benefit from the technology advance. A streaming service eliminates that barrier to entry—provided you don’t mind not owning your music. If I were banished to a deserted island and allowed to bring one album with me, I’d take Steely Dan’s Aja. I had to settle for the band’s 2000 reunion album Two Against Nature, streamed from Tidal HiFi,for my MQA listening test, as that’s the only album in the band’s catalog that’s been remastered in MQA to date. Fortunately, the band doesn’t have a bad album in its catalog, so I wasn’t too disappointed, but it’s problematic that MQA isn’t already more ubiquitous.

Explorer2 headphone test Michael Brown

I evaluated the Explorer2 with a variety of headphones, including (from left to right) Bowers & Wilkins P5 mobile headphones, JH Audio’s JH13 Pro in-ear monitors, and Blue Microphones’ self-amplified Mo-Fi (with the amp turned off).

The company has deals with Warner Music Group and Universal Music Group, but that doesn’t mean those companies’ entire libraries are available in MQA format. All that music must be remastered to gain the benefits that MQA offers. But the labels that have signed up with MQA are also making new albums—such as Sheryl Crow’s Be Myself, Gorillaz’ Humanz, Beyoncé’s Lemonade, and the Niko Case, K.D. Lang, Laura Veirs collaboration Case/Lang/Veirs—available in MQA format. On Tidal, at least. I couldn’t find any of those albums available for purchase as a digital download in MQA format.

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