Art Dudley July 2011

Art Dudley wrote about the QB-9 in July 2011 (Vol.34 No.7):

If I owned such a number of CDs that my servants and I couldn't rip them all ourselves, I'd consider buying another CD player to replace my 12-year-old Sony SCD-777ES, which itself replaced a perfectly nice Naim CD3—a move of questionable wisdom, now that I think about it. But today, thanks to breakage, loss, and generosity, my CD collection is contracting, even as my vinyl and shellac collections expand. (The universe is expanding too, but not fast enough.)

Computer audio is not only the right choice for me: It's a happy choice. The genre is still fun—especially if you avoid upturning the rocks beneath which the Internet's computer-audio "experts," who belch condemnation at every approach that isn't their own, lie in wait. And it's still affordable: The audio perfectionist who already has a free copy of Apple's iTunes on his or her computer is able to get up and running for just a few hundred dollars, with USB-to-S/PDIF converters and USB digital-to-analog converters from HRT, Musical Fidelity, Stello, and a growing list of others. Computer audio is the road to freedom from obsolescence, extortionate prices, and those glorified kitchen-table manufacturers who thanked their best customers—the people who bought the first multi-thousand-dollar CD players of the late 1980s and early 1990s—by neglecting to stock enough spare parts to keep their overpriced goods running for more than five years. Throw in freedom from ugly, splintered, useless CD jewel cases and the matter is settled.

By the same token, there exist more expensive options that promise more than just CD-quality (footnote 1) sound. Consider the successful QB-9 USB D-to-A converter, which Ayre Acoustics introduced two years ago for the moderate sum of $2500. Ayre kindly loaned me a sample—and then, toward the end of last year, called it back for what I assumed would be improvements. Charles Hansen, Ayre's CEO, was quick to set me straight: "The new version doesn't sound any better. It just has an extra feature: It can go to 192kHz instead of just 96kHz." Fair enough. But because it might sound better when it does that, I asked to reborrow the same QB-9. (Hansen saw no reason to alter the model name: "We knew when we started it would have to change eventually.")

Ayre endeavors to make all their product upgrades retrofittable, and so it goes with the 192kHz version of the QB-9: The retail price was bumped to $2750, and people who invested in the early QB-9 can have theirs upgraded at the factory for the price difference alone: $250. Charles Hansen says he would've done it for less if he could have. "The part that would go to 192 was only a little more expensive, but then we had to add another board and change the power supply, too." The new chip—an XMOS XS-1 from Bristol, UK—is simply a microprocessor, and thus requires a separate receiver chip.

There remains a lack of controls on the Ayre's front panel, but the DIP switches on the back have taken on a new shine: One of them controls whether the QB-9 is connected at Class-1 USB or Class-2 USB data-transfer speed, the latter required for sampling frequencies higher than 96kHz. The choice is also determined by the owner's computer operating system: Although Class-2 USB capabilities have existed on Macs for a number of years, it wasn't until OS 10.6.4 that sample rates beyond 96kHz were supported. Windows users may require an extra driver, but Charles Hansen says that the prep work isn't daunting: "For Class-2 you do need to have your computer pretty current, but we spell it all out on our website."

Reconnecting the review sample to my Apple iMac (OS 10.6.5 at present) was, as they say in Bristol, a doddle. And I prepared for the experience by loading up on high-resolution music files, including some of the great 24-bit/176kHz Rolling Stones offerings on But therein was the hoop through which I still needed to jump: Before changing from one music-file sampling rate to another, Mac users must exit iTunes entirely, pull up the Apple Midi utility, manually select the new rate, then launch iTunes—every time. (Good heavens: Next they'll have us flipping our records and plucking the dust from our needles!) For that reason, and to investigate the claims of better sound from hi-rez files, the time had come for me to try some alternatives to Apple iTunes. . .

Listening to Amarra play 176 and 192kHz music files through the updated Ayre QB-9, having applied to my computer-music system some recently offered tweaks (more on that in a moment), it appeared that I had reached the same performance heights as with the high-resolution, Ethernet-powered Linn Majik DS-I digital player. The NAS (Network Attached Storage) that I used for that review (published in the March 2011 issue) is no longer here in Cherry Valley, but in the weeks ahead I hope to purchase and download some of Linn's own hi-rez WAV files, which I hope will offer the basis for an enduringly interesting comparison . . .—Art Dudley

Ayre Acoustics
2300-B Central Avenue
Boulder, CO 80301
(303) 442-7300

hollowman's picture

I was looking for copyright and/or patent info on "Streamlength" and found none (only a TM).
Please reply with more info on this issue as necessary. Thx!