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Hi-Rez Audio Distinguished in Blind Testing
Jim Austin  |  Dec 16, 2019  |  71 comments
Spectral analysis of a live blues band recording made by John Atkinson, showing content up to 40kHz, from "What's Going On Up There?"

At the October 2019 Audio Engineering Society convention in New York, Yuki Fukuda and Shunsuke Ishimitsu, both of Hiroshima City University, presented results that show quite clearly that listeners can distinguish sounds encoded and reproduced at different sampling frequencies. Their trials differed from the previous ones in one important way: Instead of exposing test subjects to music at different resolutions, they used test tones.

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FeaturesMiscellaneous
High-End Tunes to Go
Jonathan Scull  |  Aug 23, 2012  |  First Published: Jul 01, 2001  |  9 comments
Photo Credit: Tim Austin Photography

A true story: I got tagged for doing a howling 90mph on the way back to New York on the Jersey Turnpike late one night and got off with a warning.

I was pulled over by a beefy young Trooper, lights blinking furiously. Oops. [heh heh]. He saw Kathleen and I weren't nuts, checked the papers and my license, then checked out the Lexus very carefully with his flashlight. There was much oohing and ahhing.

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FeaturesThink Pieces
How To Write Manufacturers' Comments
Robert Deutsch  |  Sep 24, 1992  |  1 comments
"Equipment Reports," "Record Reviews," "Letters," "Industry Update," "Sam's Space," "As We See It," "The Final Word"---I read and enjoy them all. But the section of Stereophile I especially look forward to reading is "Manufacturers' Comments." How is the manufacturer going to respond to a review that's considerably less than 100% positive? Can they take criticism gracefully, or do they have an attitude? If I were a consumer considering purchase of one of their products, would their comments convince me that they'd be a good company to deal with? Are they uptight beyond reason, or do they have a sense of humor? Can they respond to a positive review without gloating?
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FeaturesThink Pieces
Illusions, Riddles, & Toys
Barry Willis  |  Nov 24, 1996  |  0 comments
Remember the old mathematical riddle about moving a football from a hundred yards out to the goal line? Known as Xeno's Paradox, it goes like this: if each time the ball is moved it travels half the distance to the goal, how many moves will it take to get there? The answer: an infinite number, because no matter how many times you cut the distance to the goal by half, you'll always be some infinitesimal distance away from it.
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Features
In Search of the Perfect 300B Tube
Peter van Willenswaard  |  Nov 27, 1999  |  0 comments
In the last two years, the available choices in 300B output tubes for one's low-wattage single-ended power amplifier have become an embarrassment of riches. If we include the souped-up versions—which, in fact, deviate from the original 1930s Western Electric (WE) specifications—the number of 300Bs to choose from now includes about 15 different brands and types.
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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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FeaturesPowerline Accessory Reviews
Installing a Dedicated AC Line
John Atkinson  |  Aug 27, 2007  |  First Published: Sep 01, 1991  |  0 comments
The most important change made to the system was one that held up the writing of my review of the Mark Levinson No.23.5 power amplifier for several months, such was its anticipated impact. Though my listening room is well-equipped with wall sockets, there are actually only two 15A circuits serving these outlets. Ever since I had converted what had hitherto been our house's master bedroom into my listening room, I had intended to run new circuits to it.
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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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FeaturesInterviews
Kevin Gray: Vinyl-Mastering Master
Sasha Matson  |  May 06, 2022  |  9 comments
When I need information about recordings, I go to Discogs. At Discogs, Kevin Gray has more than 2500 entries. That's as good an indicator as any of the amount of ground he has covered in his career so far as a creative participant in the recorded-music art known as mastering. Since starting out in the early 1970s, in Los Angeles, he has worked for all the major music labels and many independents, in all music genres.
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FeaturesHistorical
Krell Power: A Visit to the Laboratory of Doctor Morbius
John Atkinson  |  Feb 06, 2020  |  First Published: Apr 01, 1986  |  10 comments
The only one who knows this ounce of words is just a token
Is he who has a tongue to tell, but must remain unspoken.—Moondog, 1968

The Lockheed 1011 sits dormant on the ground at Chicago's O'Hare airport. "We have a little light bulb problem here" drawls the pilot in the approved Right Stuff manner. "We don't know if it's the bulb or what, we'll let you know."

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FeaturesPowerline Accessory Reviews
Lighting Strikes: a Bolt From the Blue
Barry Willis  |  Apr 09, 2019  |  First Published: Feb 01, 1994  |  5 comments
One evening late last summer I took the most expensive workout of my life. In my hurry to meet a friend at the gym, I left the house, leaving my computer and hi-fi on despite the ominous look of the sky. In the South, experience teaches you to dash about disconnecting everything at the first sign of a thunderstorm. Usually I do, but this time my mind was elsewhere.
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FeaturesJ. Gordon HoltThink Pieces
Lights in a Box?
Steve Guttenberg, J. Gordon Holt  |  Jan 03, 1996  |  0 comments
"Without content, television is nothing more than lights in a box."
---Edward R. Murrow.
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Audiophile EssentialsFeaturesHistoricalReference
Listening Tests and Absolute Phase
John Atkinson  |  Dec 05, 2017  |  First Published: Nov 01, 1980  |  22 comments
The problem confronting the magazine reviewer when organising the necessary listening tests to accompany/reinforce the measured behavior of a device under test is complex. There has never been a problem with the measurement aspect; as long as someone has access to the same test gear—and full knowledge of the test conditions—then he should be able to replicate the critic's findings exactly (assuming an infinitely narrow spread of behaviour from sample to sample—a rasher assumption with some manufacturers' equipment than of others). However, when it comes to determining reliably the audible (or inaudible?) effects on music program by an amplifier/cartridge/loudspeaker etc. then the going gets tough.
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FeaturesMQAReference
Listening to MQA
John Atkinson  |  Aug 18, 2016  |  67 comments
Last June, Jim Austin briefly discussed the operation of MQA in his review of the Meridian Explorer2 USB DAC, but you can find a more detailed explanation on Stereophile's website here and here. MQA involves two fundamental concepts, discussed in a paper presented to the Audio Engineering Society in October 2014. The first is responsible for a large reduction in the bandwidth required to store and stream high-resolution files, the second for a potential improvement in sound quality. . .
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Features
Looking Back at the 1980s
Martin Colloms  |  Dec 31, 2009  |  First Published: Dec 31, 1990  |  0 comments
A freelance reviewer's workload is erratic. On the odd occasion one might have a few moments' respite, while at other times the coincidence of multiple deadlines for copy results in several weeks of panic. As I write this missive I have just completed one such overload period covering so much equipment that I thought that it would be worthwhile to look back and take stock at the audio in the past decade (footnote 1).
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