Digital Processor Reviews

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John Atkinson  |  Jul 27, 2012  |  First Published: Aug 01, 2012  |  16 comments
When it comes to getting audio from a PC via its USB port, the buzzword du jour is asynchronous. This cryptic term refers to which device has control over the timing of the audio data being streamed from the computer: the computer itself, or the device receiving the data. It might seem logical to have the computer control the timing, but this is not so. When digital audio data are converted to analog by a D/A converter, control over exactly when each dataword is converted is critical for the best quality of sound. Any uncertainty in that timing manifests itself as analog distortion, aka jitter.
John Atkinson  |  Dec 23, 2010  |  3 comments
The weekly Vote! Page is one of the most popular features of the Stereophile website, and the August 22 question, "Should Stereophile review more or fewer computer-audio products?", generated a record number of responses. No less than 88% of those responding asked for more coverage of products that allow a computer to be a legitimate source of music in a high-end context. Just 7% of readers wanted less coverage.
Wes Phillips  |  Apr 23, 2006  |  0 comments
Looking at all of the high-end headphones and headphone accessories available today, it's difficult to even remember how barren the head-fi landscape was in the early 1990s. Back then, headphones got no respect, except for exotic, expensive electrostatic models, yet most of the world listened to music through headphones all the time, mostly through crappy cans connected to portable players. (Well, maybe it wasn't that different a landscape.)
John Atkinson  |  Nov 24, 2021  |  10 comments
In the summer of 2021, MoFi Distribution's Jonathan Derda emailed me about the South Korean HiFi Rose brand. "This brand strikes me as being the spiritual successor to the original SlimDevices Transporter and Squeezebox Touch," he wrote. "We're all really excited about it."

John Atkinson  |  Aug 28, 2020  |  55 comments
The email from Herb Reichert was intriguing. "I am, with great difficulty writing about HoloAudio's new two-chassis May DAC," he wrote. "It is death quiet and very natural. It makes every recording sound non-digital."

Once Herb had finished writing his review of the HoloAudio for the August issue's Gramophone Dreams column, I sped to his Bed-Stuy bothy and grabbed the May DAC, both to get it on my test bench and to take a listen for myself.

Herb Reichert  |  May 03, 2018  |  15 comments
While covering CanMania at the 2017 Capital Audiofest, I was sitting at the table of HeadAmp Audio Electronics, listening first to John McEuen singing Warren Zevon's "Excitable Boy," from McEuen's Made in Brooklyn (24-bit/192kHz AIFF, Chesky JD388/HDtracks), then to Macy Gray's Stripped (24/96 AIFF, Chesky JD389/HDtracks). I was listening through HeadAmp's extraordinary GS-X Mk.2 headphone amplifier ($2999–$3199), but midway through Gray's "I Try," I stopped, pulled the Audeze LCD-4 headphones off my head, and asked HeadAmp's head of sales and marketing, Peter James, what DAC he was using.

"Do you know the HoloAudio Spring DAC?"

Art Dudley  |  Jun 13, 2013  |  1 comments
No history of the computer-audio marketplace could be complete without some mention of High Resolution Technologies, the California company whose Music Streamer was, in 2009, the first perfectionist-quality USB digital-to-analog converter to sell for as little as $99. One could argue that HRT's entire business model has contributed to shaping our attitudes toward the hobby: Because digital-audio technology continues to evolve at such a rapid pace, HRT has introduced a succession of newer and ever more effective Music Streamers, occasionally to the obsolescence of their predecessors; yet because those products have all been so affordable—remarkably and laudably so, given their thoroughly American provenance—we tend not to mind.
Jon Iverson  |  Feb 23, 2011  |  6 comments
Art Dudley and others have covered the first products released by HRT, and now the company has added to its product line a Pro version of its Music Streamer, which sports balanced circuit design from tip to tail.

Housed in the same simple, functional, six-sided case of extruded aluminum as HRT's other products, the Pro is painted a bright blue to distinguish it from the Music Streamer II (red) and Music Streamer II+ (gray). At 5.6" it is also a tad longer than the others, and includes a single B-type USB 1.1 jack centered on one end, and two small, fully balanced TiniQ output jacks on the other. More about these special mini sockets later.

Art Dudley  |  Nov 20, 2009  |  0 comments
My favorite moment in the Zack Snyder film Watchmen—apart from the Dylan-fueled title sequence, which itself contains some of the most memorable scenes in recent cinema—comes when retired crimefighter Daniel "Nite Owl II" Dreiberg arrives home to find the doctrinaire and mildly crazy Walter "Rorschach" Kovacs in his kitchen, eating beans straight from the can. The startled Dreiberg asks his visitor, "Would you like me to heat those up for you?"
Art Dudley  |  Nov 13, 2009  |  0 comments
Every now and then an affordable product comes along that's so good, even wealthy shoppers want it. Past examples in domestic audio include the Rega RB300 tonearm, the original Quicksilver Mono amplifier, the Grace F9E phono cartridge—even Sony's unwitting CD player, the original PlayStation. Based on word of mouth alone, one might add the HRT Music Streamer+ to that lauded list.
Alex Halberstadt  |  Jul 27, 2022  |  13 comments
My little corner of Brooklyn happens to have a terrific little record shop. I like it for the usual reasons: well-chosen merchandise, fair prices, fun music on the speakers while you browse. But I like it just as much because great record stores tend to resemble one another in more idiosyncratic ways, and this one has the earmarks of the great record stores of my youth.
Art Dudley  |  Apr 30, 2013  |  First Published: May 01, 2013  |  2 comments
Bratty, mollycoddled, and altogether spoiled consumers such as you and I have inflicted on computer audio the same injustice that laparoscopic surgery, antilock brakes, mobile telephones, word processors, e-mail, microwave ovens, and over-the-counter proton-pump inhibitors have suffered at our hands in recent years: In less time than it takes to say "ho-hum," we've knocked it from the pedestal to which all such breakthroughs are entitled and begun taking it for granted.
Sasha Matson  |  Aug 08, 2023  |  8 comments
Stereophile writers and website commentors often speak to the topic of the ongoing rise in retail pricing at the upper levels of the hi-fi market. Companies producing cost-no-object designs make regular appearances in the hardware reviews published here. However, a countervailing vector is also at play in the consumer hi-fi sector: a trend toward bringing to market products that are smaller and more economical than the competition while offering an ever-increasing variety of features and continually improved performance, notably in terms of measurable specifications.

This dialectic can sometimes play out within the same company. Abbingdon Music Research (AMR), which is based in Southport, UK, was founded in 2000. At first, under the AMR brand, the company focused on high-end audio component separates with price points toward the upper end of the spectrum. The world has a way of intervening, though, even with the best-laid business plans. AMR Director Vince Luke describes in a video how his company made a deliberate choice to "pivot from high end to low end" following the financial crash of 2008. AMR's iFi Audio division debuted at the Rocky Mountain Audio Fest in 2012, offering a handful of portable products. They were a hit. The iFi line has since expanded to include more than 50 designs, and new products are introduced with impressive frequency.

Herb Reichert  |  Jan 03, 2019  |  52 comments
On the first page of the owner's manual for iFi Audio's Pro iDSD tubed/solid-state multibit DAC and headphone amplifier, the British company unabashedly describes it as "a 'state of the art' reference digital to analog converter" and "a wireless hi-res network player or the central DAC in an expensive high-end home system." As if in an afterthought, it continues: "The on-board balanced headphone section means high-end headphones can also be directly connected to it." The manual doesn't describe the headphone "section" as "state of the art," so I'm deducing that the Pro iDSD is really more a fancy-pants DAC than a high-tone headphone amp.
Julie Mullins  |  Dec 31, 2021  |  17 comments
It had been a while since I'd done any serious, critical listening through headphones. That changed when Editor Jim Austin asked if I wanted to review the iFi Audio ZEN Signature Set ($599). Figuring I could use more Zen in my life, I agreed.

UK-based iFi Audio, which operates under the auspices of the Abbington Global Group, has released several compact products in its ZEN series: DACs, headphone amps, a Bluetooth receiver, and a network streamer.

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