Resonessence Labs Herus USB Headphone DAC

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HERUS-LR.pngFor those of us who travel a lot, it's tough to be away from home. We miss our family. We miss our dog. We miss our 600-thread-count cotton sheets, but the road beckons. More than 25 years ago, I started bringing my audio with me on the road when I used to travel from my childhood home of Philadelphia to our family home in Scottsdale, Arizona. My travel rig back then included a bulky Sony Discman, powered by eight AA batteries and rocking an internal AM/FM tuner. I had some mismatched yellow plastic Sony workout headphones that positioned the rock-hard earbuds into my ear canals in a way that was, to be polite, uncomfortable. Thankfully, we'd connect in Dallas on many trips out, as the eight AA batteries were dead before I got to DFW, thus requiring another pricey investment.

Roll the tape forward to the introduction of Apple's iPod, and the game changed. I was lucky enough to get an iPod two weeks before its launch through Apple's PR firm, and it changed the game for me, as you could easily get 3,000-plus songs (granted in pretty crappy, Napster-like resolution) in the palm of your hand and with long battery life. I added to my beloved first-generation iPod a pair of Etymotic Research ER-4A in-ear monitors. At the time, they were a really professional audio solution but sounded ten times better than any other small, portable headphones. What was cool about the Etymotics was that you could have custom ear molds made that fit your ear perfectly and thus blocked out lots of background noise.

Additional Resources

  • For more information on Resonessence Labs got to
  • To learn more about DACs visit
  • Grab some high-quality audio tracks to use with a DAC at

Roll the tape forward to today, and you have a world where there are more than 150,000,000 Apple iPads in the market and laptops are basically media hubs loaded with music in HD (thank you,, Acoustic Sounds, and others) as well as TV shows, movies, and other content waiting to distract you from the agony of traveling. Starting at this year's Rocky Mountain Audiofest, I took on the challenge of making another upgrade to my travel rig. First was a new set of headphones, which started out as a customized pair of Ultimate Ear UE7-Pros and then morphed into the Ultimate Ear Studio Monitors that were designed in conjunction with Capitol Record Studios in Hollywood to be the most resolute two-way, high-performance headphones you can purchase. Designed more for performers than for audiophiles, these earphones required some tricks to get the setup perfect, including a sit-down for an ear-fitting, a hearing test, and an ear-cleaning (a wild experience if you've never done it). With new headphones in play, I decided to start looking at other goodies to make my travel rig ultra-high-tech and ultra-lightweight, but also to sound as good as possible. This brought me to the Resonessence Labs Herus DAC ($399). Writer Brent Butterworth and studio tuner Bob Hodas had mentioned that they heard this small, portable DAC and that it was worthy of note, so I ordered one at once.

IphoneHerus copy.jpgThe Herus is a portable DAC made out of a small but rock-solid chunk of aluminum. It's diminutive in size, about 1.25 inches wide by 2.5 inches long by 0.75 inches high. It weighs practically nothing and is powered from the USB port on your laptop, so it needs no power source, which makes it excellent for travel purposes. On one side of the DAC is the USB input; on the other side is a 0.25-inch analog headphone output. Personally, I don't have many headphones with a quarter-inch jack, so I ordered a nicely-made Sony one-quarter-to-one-eighth-inch converter jack to plug any number of headphones into this DAC. You do need a cable to get from your laptop to your Herus, and I went with a nine-inch USB (rectangular) to USB (square) Transparent cable that's also small, somewhat flexible, priced around $100, and sold through dealers or online. Wireworld also makes some really nice, high-end USB cables that I want to try with my travel rig.

Once you are done plugging in your headphones or desktop speakers (I also used X-HiFi XDC-1 electrostatic speakers with a sub for some nearfield listening), there was only one more trick left, which was to go into the settings on my Mac and select the Resonessence Labs Herus as the audio source. I switched to that DAC and BOOM ... I was rocking.

The Herus is a USB 2.0 asynchronous DAC that works on Apple, Windows, and Linux platforms. It can be easily firmware-updated when needed, but it came out of its tiny box ready to rock for my system. A Thesycon USB driver is reportedly needed to make the DAC work on a PC, but I didn't get to test that, as I mainly used an Apple Macbook Pro as my source both for headphone and nearfield listening. As amazing as an Apple laptop is, it just doesn't pack the audiophile-quality DACs to replay today's HD content at its best or, better yet, scale SD content to better-sounding, upconverted audio, as most of my content is in full-resolution CD-quality AIFF files.

Continue to Page 2 to hear samples from classic and recent albums that demonstrate what the DAC can do, plus Highs, Lows, and the Conclusion . . . 

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