Digital Processor Reviews

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Digital Processor Reviews
dCS Rossini v2.0 firmware upgrade
Jason Victor Serinus  |  May 28, 2019  |  23 comments
British digital-audio specialists dCS (Data Conversion Systems) has been on a roll. Since the September 2015 introduction of the Rossini DAC ($23,999), the single-box Rossini Player ($28,499), and the Rossini Clock ($7499), they've released a number of new products and software/firmware updates. In 2016 came network firmware updates that established dCS DACs and Players as Roon endpoints. 2017 brought improved (v1.05) software for the Rossini DAC and Player, and 2018 an update to process MQA, followed by the October 2018 introduction of the Rossini upsampling SACD Transport ($23,500—see John Atkinson's review in the May 2019 Stereophile). Then, in January 2019, dCS released their Rossini v2.0 software, which applies to both the Rossini DAC and the Rossini Player, and which is offered free to Rossini owners.
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Digital Processor ReviewsFeaturesReference
Jitterbuggin'
Robert Harley  |  May 28, 2019  |  First Published: Nov 01, 1994  |  7 comments
If there's one buzzword in high-end audio for the 1990s, it's undoubtedly jitter. "Jitter" describes timing variations in the clock controlling the ones and zeros that represent the analog audio signal. If that clock isn't stable to an extraordinarily precise degree, the sound quality of the digital processor will be degraded.

A CD transport/digital processor combination introduces jitter in three ways: 1) the transport puts out a jittered signal; 2) the S/PDIF or AES/EBU interface between the transport and processor creates jitter; and 3) the digital processor adds its own jitter to the clock. These additive factors are largely responsible for the great range in sound quality we hear from different transports and interfaces.

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Digital Processor ReviewsGramophone DreamsHeadphone Reviews
Gramophone Dreams #28: PS Audio & HiFiMan
Herb Reichert  |  May 23, 2019  |  3 comments
Every time I review a digital-to-analog converter, my memory drifts to the spring of 1983, when the first Compact Discs arrived at Tower Records in New York City. They appeared in the opera section. Sitting next to big, thick boxed sets of opera LPs, these new discs looked truly compact. A few months later, boxed sets of popular opera LPs, in almost untouched condition, began selling in the Tower Annex for $1/disc.
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Budget Component ReviewsDigital Processor ReviewsHeadphone Reviews
Pro-Ject Pre Box S2 Digital D/A headphone amplifier
Ken Micallef  |  Mar 29, 2019  |  23 comments
I first met Pro-Ject Audio Systems' founder and president, Heinz Lichtenegger, in 2016, at the US launch of the Austrian company's The Classic turntable. His passion for all things hi-fi was so intense I thought his head might explode. Gleeful in his mission to bring high-end audio to the people at less than typical high-end prices, Lichtenegger and Pro-Ject can fairly claim bragging rights for their entry-level Debut Carbon (DC) ($460 and up), one of the world's best-selling turntables.
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Digital Processor ReviewsMedia Server Reviews
Naim ND5 XS 2 media player
Art Dudley  |  Mar 19, 2019  |  8 comments
The late Julian Vereker, the sharp-minded former racing driver who founded Naim Audio and designed its first products, did so because he wanted audio amplification of a quality he felt no one else was making at the time, reasoning that if he wanted such a thing, so might others. Thus came about Naim's first domestic-audio product, the distinctive NAP200 solid-state amp (1973).
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Digital Processor Reviews
EMM Labs DV2 D/A processor
Jason Victor Serinus  |  Feb 28, 2019  |  15 comments
For years, I've attended audio shows at which the Canadian company EMM Labs, either on its own or in conjunction with Kimber Kable and IsoMike, has displayed some of the grandest, most impressive-sounding multichannel systems I've ever heard. When everything was aligned properly, as it was at the 2018 Rocky Mountain Audio Fest, the sound was breathtaking.
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Digital Processor ReviewsIntegrated Amp Reviews
CH Precision I1 Universal integrated amplifier
Jason Victor Serinus  |  Jan 31, 2019  |  40 comments
"The sound was to die for," I wrote shortly before my resurrection. I was taking notes about the sound of CH Precision's D1 SACD and CD Drive (now $38,000) and C1 D/A Controller (base price $32,000), in the demo room of Michael Woods's Elite Audio Systems, at the California Audio Show, just three months after the 2015 edition of the Munich High End show. CH Precision's L1 dual-mono, solid-state preamplifier (now $58,000), M1 dual-mono power amp ($104,000), and X1 external power supply ($17,000) had helped deliver "fantastic sound."
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Digital Processor Reviews
iFi Audio Pro iDSD D/A processor/headphone amplifier
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.
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Digital Processor Reviews
Chord Electronics Qutest D/A processor
John Atkinson  |  Dec 27, 2018  |  48 comments
Back in the mid-1990s, I believed that the design of D/A processors was fundamentally a solved problem. The resistor-ladder, multi-bit DAC chips of the 1980s, with their linearity errors, had been replaced by sigma-delta types that had minimal linearity error down to the lowest signal levels. All that remained for the designers of PCM D/A chips was to increase resolution and dynamic range to the theoretical limits, and to improve the mathematical precision of oversampling digital filters to match the performance of the 20- and 24-bit recordings that had just begun to be released.
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Digital Processor Reviews
Mytek Liberty D/A processor
Art Dudley  |  Oct 25, 2018  |  18 comments
I've never aspired to owning a BMW 7-series, or a Martin D-45, or a Rolex Submariner: BMW's far less expensive 3-series models capture my imagination by bordering on the affordable, likewise Martin's D-18—and as long as I live, I'll never understand the appeal of expensive wristwatches. Bling's not my thing.

True to form, when I visited the Mytek display at High End 2018, in Munich, my attention was drawn to the brand-new Mytek Liberty DAC and its three-figure price: for $995, one could now own the equivalent of the original Mytek Brooklyn D/A processor, without that model's phono preamp—this according to the company's Adam Bielewicz, who served as my product-line guide on that sunny May day.

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Digital Processor ReviewsMusic in the Round
Music in the Round #93: miniDSP & Ripping SACDs
Kalman Rubinson  |  Sep 06, 2018  |  12 comments
As I took my valedictory lap around High End, the immense audio show held each May in Munich, Germany, it was clear that this year's event was an exuberant flowering of mature technology. I witnessed the dominance of hardware for LP playback, as well as analog amplifiers, many of them based on tubes, and passive loudspeakers with traditional cone-and-dome drive-units. And there was no shortage of excellent and impressive musical demonstrations. Still, I experienced no revelations, and heard no announcements of any new technology that might trigger a hopeful anticipation of the near future. It was as if HE2018 were reflecting on the past with reverence and commitment, rather than striving toward the future with innovation and adventure.
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Digital Processor Reviews
BorderPatrol Digital to Analogue Converter SE
Herb Reichert  |  Aug 23, 2018  |  20 comments
The trouble with a classicist he looks at the sky
He doesn't ask why, he just paints a sky—John Cale and Lou Reed, "Trouble with Classicists," from Songs for Drella

Left brain/right brain, yin/yang, male/female, Apollonian/Dionysian, classical/romantic, painterly/linear, dark/light, hard/soft, warm/cool...I use these contrasting adjectives in my reviews because I feel some confidence in their ability to convey the nature of what I experience while listening to recordings with whatever new audio box sits before me in the listening studio.

I also use: accurate (I hate that word), neutral (what's that?), colored, clean, transparent, open, musical. Sadly, I have little confidence in their ability to describe my experiences.

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Digital Processor ReviewsMedia Server ReviewsMusic in the Round
Music in the Round #92: Digibit Aria Piccolo +
Kalman Rubinson  |  Jun 26, 2018  |  62 comments
Lovers of high-resolution multichannel sound still don't have it easy. While the two-channel market is replete with snazzy, efficient music servers in stylish boxes, the only multichannel equivalents are Merging Technologies' Merging+Player Multichannel-8, and a handful of stereo devices that are rumored to do multichannel, though no such claims are made in print. To be candid, the latter will play multichannel tracks via USB, Ethernet, or HDMI outputs to suitable DACs (but that's another story), but because they're aimed at the two-channel market, they tend to skimp on the CPU horsepower and RAM needed to handle higher-resolution multichannel files. Even the Merging+Player Multichannel-8 ($13,500), with its Intel i3 CPU running Roon, couldn't entirely keep up with everything in my library.
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Digital Processor Reviews
Aqua Acoustic Quality Aqua Formula xHD D/A processor
Jason Victor Serinus  |  May 24, 2018  |  50 comments
At the 2018 Consumer Electronics Show, when John Atkinson and I entered the room shared by Lamm Industries, Aqua Acoustic Quality, and Kharma room, we were looking for two things: good sound, and digital products for me to review. When we spied AAQ's Formula xHD digital-to-analog converter, the possibility of evaluating a potentially excellent DAC made by someone other than the usual suspects felt like a golden opportunity.
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Digital Processor Reviews
HoloAudio Spring "Kitsuné Tuned Edition" Level 3 D/A processor
Herb Reichert  |  May 03, 2018  |  16 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?"

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