Computer Audio Reviews

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Computer Audio ReviewsDigital Processor ReviewsPhono Preamp ReviewsSolid State Preamp Reviews
Mytek Digital Brooklyn Bridge II Roon Core preamplifier
Tom Fine  |  Sep 01, 2023  |  8 comments
The concept of streaming digital music files over distances great (as with internet-streaming services like Spotify, Qobuz, Tidal, etc.) and small (from a home-PC hard drive, NAS, or networked music server) became mainstream only recently. But it was already brewing during the late 20th century, with people illegally downloading low-bitrate MP3 files made from CD rips and coming close to killing the recorded-music industry.

That wasn't streaming exactly, or not in the current sense, because the files needed to be downloaded, stored locally, then either played out of a computer or loaded onto a portable player, but from that point forward it was a steady march to the streaming-dominated present.

Never mind Napster—the first subscription audio "streaming" service was one you probably wouldn't think of: Audible, the audio book service now owned by Amazon, which started up in 1995. I did beta testing and editing work for early-days Audible, and around that time, I started loading up home-ripped MP3 files on a pocket-sized Rio MP3 player (which by then had replaced Audible's proprietary player), using it in place of a portable CD player. This led to experiments with a PC music library/player running Linux, controlled by a Handspring PalmOS device connected to the stereo system via a Sound Blaster 16 card.

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Computer Audio ReviewsPhono Accessory ReviewsPhono Preamp Reviews
Channel D Pure Vinyl 5 & Seta L phono preamplifier
John Atkinson  |  Oct 22, 2020  |  11 comments
Ever since I stopped using my Audio Research SP10 preamplifier in the early 1990s—its eight phono-stage tubes used to get too noisy too quickly—I tried a variety of standalone phono preamplifiers. Seeing the most service through the 1990s and 2000s were, first, a Mod Squad Phono Drive EPS, then a Linn Linto, both of which I purchased. But when I measured Channel D's Seta Model L, which Michael Fremer reviewed in the August 2010 issue, the Linto was pushed to one side. The battery-powered Seta L (footnote 1) had the lowest noise and distortion I had encountered in a phono preamplifier, and I eventually bought the sample I had been sent for a follow-up review in 2013.
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Budget Component ReviewsComputer Audio ReviewsStand Loudspeaker Reviews
Vanatoo Transparent One Encore powered loudspeaker system
Jason Victor Serinus  |  Jun 25, 2019  |  22 comments
Has Serinus been demoted? You might well ask. This month, instead of reviewing a $58,000 stereo amplifier, I'm tackling a $599 powered loudspeaker system.

Truth be told, I'm always on the lookout for products that deliver outstanding sound at bargain prices. And since I maintain in my living room a modestly priced system built around powered speakers—this in addition to the far costlier system in my dedicated listening room—it's an easy fit for me to evaluate low-priced products in a real-world context.

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Computer Audio ReviewsDigital Processor ReviewsMedia Server ReviewsMusic and Recording FeaturesMusic in the Round
Music in the Round #85: Nimitra, exaSound, Baetis, Roon
Kalman Rubinson  |  Jun 29, 2017  |  7 comments
It's been going on for a while now: Despite support for multichannel in audio/video receivers and A/V processors priced from as little as $200 to $30,000, there are still very few offerings that cater to the music listener. They may offer stereo-only streaming features through their USB or Ethernet inputs, but these inputs don't see your multichannel files. To handle such files, they would require you to add a music server with HDMI output. However, I know of no turnkey music servers that will output multichannel audio via HDMI.
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Computer Audio ReviewsFeaturesMQAReference
Inside MQA
John Atkinson  |  May 19, 2016  |  41 comments
Jim Austin briefly discusses MQA in his review of the Explorer2 in this issue, but a more complete description of MQA can be found in an article posted on Stereophile's website at the end of 2014.

MQA involves two fundamental concepts, discussed in a paper presented to the Audio Engineering Society in October 2014, the first responsible for a potential improvement in sound quality, the second responsible for a large reduction in the bandwidth required for storage and streaming of high-resolution files...

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Computer Audio ReviewsMusic in the RoundSubwoofer Reviews
Music in the Round #76
Kalman Rubinson  |  Dec 30, 2015  |  1 comments
In my last column, in the November 2015 issue, I talked about Marantz's AV8802A preamplifier-processor and two accessories: UpTone Audio's USB Regen, and a DIY battery supply for my DAC. This month's column is all about accessories, and for me that's unusual. Some items, like interconnects and speaker cables, are usually considered accessories because they're not fundamental components (eg, source, amplifier, speaker), even though they're essential to getting any sound at all.
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Computer Audio ReviewsMedia Server Reviews
Questyle Audio QP1R hi-rez portable player
John Atkinson  |  Dec 01, 2015  |  5 comments
The 2015 T.H.E. Show in Southern California clashed with my having to be in the office to ship our August issue to the printer, so I wasn't able to attend. But in devouring the online coverage on www.stereophile.com and its sister sites, on InnerFidelity.com I found a report by Tyll Hertsens about two new hi-rez portable players that made their debuts at T.H.E. Show: Questyle Audio Technology's QP1 ($599) and QP1R ($899).
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Computer Audio ReviewsDigital Processor Reviews
UpTone Audio USB Regen
Michael Lavorgna, Kalman Rubinson  |  Nov 04, 2015  |  8 comments
UpTone Audio's USB Regen is a powered, single-port USB 2.0 hub that takes the USB signal from your computer, regenerates (ie, reclocks) the data, provides cleaned-up 5V power from a built-in, ultra–low-noise regulator, and sends an impedance-matched signal to your DAC. The Regen is designed to sit as close to your DAC as possible; UpTone supplies a male/male USB A/B adapter—a solid, double-ended plug, which they recommend over the 6"-long male/male USB A/B cable they also provide.
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Budget Component ReviewsComputer Audio Reviews
Roon Labs Roon v.1.0 music-playback app
Jon Iverson  |  Sep 25, 2015  |  3 comments
There are dozens of music-playback programs for computers, touchpads, and smartphones, ranging from Amarra, Audirvana, JRiver, Pure Music, and VLC, which manage libraries or work with library software, to programs that are integrated with a specific distribution service: Pandora, Spotify, Tidal, and, of course, iTunes. Still others, such as Sonos, are integrated with a dedicated hardware product.
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Budget Component ReviewsComputer Audio ReviewsDigital Processor ReviewsMiscellaneous
AudioQuest JitterBug USB noise filter
John Atkinson  |  Sep 03, 2015  |  18 comments
I got an early start on computer audio. At the end of the last century I was using WinAmp with first a CardDeluxe PCI soundcard, then a similar card from RME, to play files on a Windows PC. After I became a MacPerson, I used FireWire audio interfaces from pro-audio company Metric Halo and an inexpensive USB-connected ADC/DAC from M-Audio. But it was with the USB version of Benchmark's DAC 1 that the computer began taking over from physical discs for my music listening. At first I used iTunes au naturel, but as I acquired more high-resolution files, I began using Pure Music to handle all the tedious audio housekeeping, assigning as a dedicated music server a G4 Mac mini I'd bought in 2006.
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Budget Component ReviewsDigital Processor ReviewsComputer Audio Reviews
ASUS Xonar Essence One Muses Edition D/A processor–headphone amplifier
John Atkinson  |  Mar 07, 2014  |  1 comments
Back in the summer of 2009, USB-connected D/A processors that could operate at sample rates greater than 48kHz were rare. Ayre Acoustics had just released its groundbreaking QB-9, one of the first DACs to use Gordon Rankin's Streamlength code for Texas Instruments' TAS1020 USB 1.1 receiver chip. Streamlength allowed the chip to operate in the sonically beneficial asynchronous mode, where the PC sourcing the audio data is slaved to the DAC. But high-performance, USB-connected DACs like the Ayre were also relatively expensive back then, so in the January 2010 issue of Stereophile I reviewed a pair of soundcards from major computer manufacturer ASUS , the Xonar Essence ST and STX, which, at $200, offered a much more cost-effective means of playing hi-rez files on a PC.
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Budget Component ReviewsDigital Processor ReviewsComputer Audio Reviews
Channel Islands Audio Transient Mk.II & VDC•5 Mk.II USB D/A processor & power supply
Jon Iverson  |  Mar 07, 2014  |  0 comments
Most folks don't even know they exist, but the Channel Islands are a chain of eight moderately sized mountains poking through the Pacific Ocean along the coast of southern California, between Santa Barbara and San Diego. The most famous of these is Catalina Island and its city, Avalon, which sit opposite San Clemente. The other Channel Islands are relatively wild and have been preserved mostly uninhabited.
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Budget Component ReviewsDigital Processor ReviewsComputer Audio Reviews
Arcam rBlink Bluetooth D/A processor
Sam Tellig, John Atkinson  |  Feb 14, 2014  |  First Published: Dec 01, 2013  |  6 comments
Am I the only one who values content and convenience over sound quality?

There. I've said it. I am not an audiophile; ie, someone who's in love with recorded sound for its own sake. The search for ideal sound can leave a person burned out and broke.

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Digital Processor ReviewsComputer Audio Reviews
Benchmark ADC1 USB A/D converter
John Atkinson  |  Feb 04, 2014  |  0 comments
Erick Lichte's review of Benchmark's DAC2 HGC D/A converter in this issue gave me an ideal opportunity to spill some ink on the company's ADC1 USB A/D converter. The ADC1 is housed in the same small case as the DAC (one rack unit high, half the rack unit width), and is offered with a black front panel with rack ears, or a silver aluminum panel without ears, either for $1795.
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Budget Component ReviewsDigital Processor ReviewsComputer Audio Reviews
HRT Music Streamer HD USB D/A processor
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.
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