John Atkinson

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John Atkinson Posted: Sep 26, 1995 Published: Sep 26, 1990 0 comments
"The only tubes that I want to see in my household are...the picture tube in my TV and the magnetron in the microwave oven," a Glendale, CA, reader recently wrote, and I guess his feelings reflect those of many when confronted by a supposedly "obsolete" audio technology. Forty years after the invention of the transistor and 20 after the widespread introduction of solid-state amplifiers (footnote 1), it must come as a shock to readers of the mass-market "slicks" that not only do a number of American manufacturers manufacture amplifiers and preamplifiers using tubes, but some of those companies—Counterpoint and Audio Research in particular—are among the more successful. It is the Classic 60 power amplifier from Minnesota-based Audio Research that is the subject of this month's lead-off equipment review.
John Atkinson Posted: Sep 05, 1995 Published: Sep 05, 1988 0 comments
"Who Stole The Bass?" asked Anthony H. Cordesman, writing about minimonitors in the April/May 1987 Stereophile (Vol.10 No.3). And for the designer of a box loudspeaker, the fundamental design decision, at any price level, is how much bass extension to aim for. It will always be possible to design a speaker with extension down to 20Hz, but will the result be musically and commercially successful? Will the designer end up with a speaker hypertrophied in that one area at the expense of every other? Will, indeed, the result be feasible technically? For example, for a given cabinet volume, gains in low-frequency extension have to be balanced against corresponding drops in sensitivity, and it is quite possible that to go for 20Hz extension will result in a 60dB/W/m sensitivity, equating with a speaker that only plays extremely quietly, and thus of no use to anyone.
John Atkinson Posted: Sep 03, 1995 Published: Sep 03, 1988 0 comments
"Who Stole The Bass?" asked Anthony H. Cordesman, writing about minimonitors in the April/May 1987 Stereophile (Vol.10 No.3). And for the designer of a box loudspeaker, the fundamental design decision, at any price level, is how much bass extension to aim for. It will always be possible to design a speaker with extension down to 20Hz, but will the result be musically and commercially successful? Will the designer end up with a speaker hypertrophied in that one area at the expense of every other? Will, indeed, the result be feasible technically? For example, for a given cabinet volume, gains in low-frequency extension have to be balanced against corresponding drops in sensitivity, and it is quite possible that to go for 20Hz extension will result in a 60dB/W/m sensitivity, equating with a speaker that only plays extremely quietly, and thus of no use to anyone.
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John Atkinson Posted: Aug 19, 1995 0 comments
As mentioned by two readers in this month's "Letters," amplifiers are used to drive loudspeakers but are almost exclusively measured into resistive loads. The reasons for this are twofold: 1) real loudspeakers both produce neighbor-annoying sound levels and tend to break when driven with typical amplifier test signals; and 2) the question as to which "standard" loudspeaker should be used is impossible to answer---at least the conventional resistive loads are consistent and repeatable.
John Atkinson Posted: Aug 02, 1995 0 comments
In the fall of 1982, I had just become the Editor of the English magazine Hi-Fi News & Record Review. Hi-fi was in a state of flux. The Compact Disc had just made its debut in Japan, but the British and American launches were six months and a year away, respectively. The Linn orthodoxy prevailed about the role of the source in system performance, but there was no agreement about what was and was not important when it came to enhancing the musical experience. "Objectivists" insisted that amplifiers and even loudspeakers had pretty much reached a design plateau where no further improvement was necessary or even desirable, while "subjectivists" were fragmented. All I was aware of was that my system, based on Celestion SL6 loudspeakers, needed more of an undefinable something.
John Atkinson Posted: Jul 30, 1995 Published: Jul 30, 1994 0 comments
A truly great preamplifier lets everything through, both music and distortion, but with such generosity that neither...is cramped and narrow.Larry Archibald (footnote 1)
John Atkinson Posted: Jul 24, 1995 Published: Jul 24, 1994 0 comments
A truly great preamplifier lets everything through, both music and distortion, but with such generosity that neither...is cramped and narrow.Larry Archibald(footnote 1)
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John Atkinson Posted: Jun 30, 1995 Published: Jun 30, 1992 0 comments
One of the great imponderables in hi-fi is how much the vibrations of a dynamic loudspeaker's cabinet walls contribute to its overall sound quality. Studies by William Stevens in the mid-1970s showed that, with some speakers, the acoustic output of the enclosure could be almost as much as that from the drive-units. Since then, responsible speaker designers have worked hard either to damp cabinet vibrations or to shift them to higher frequencies where their effect on the music will be less deleterious.
John Atkinson Posted: Jun 01, 1995 Published: Jun 01, 1994 0 comments
In recent years, computer modeling, finite-element analysis, and laser interferometry have brought about a huge increase in our knowledge about what makes the moving-coil loudspeaker drive-unit work. Nevertheless, it has remained fundamentally unchanged since it was invented by Rice and Kellogg more than 60 years ago. That doesn't mean that it hasn't been refined considerably; in this review I examine the performance of a design whose drive-unit technology has been taken to the limit of what is currently possible, the B&W Silver Signature.
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John Atkinson Posted: May 26, 1995 Published: Aug 06, 1986 0 comments
From London, England, to Santa Fe, New Mexico, is a pretty big jump, both geographically and culturally. From Hi-Fi News & Record Review to Stereophile, however, is a mere hop; the similarities overwhelm the differences. Unlike the US, mainstream magazines in the UK have managed to keep in touch with the fact that hi-fi components sound different; to edit and to write for an ostensibly "underground" American magazine presented no major philosophical problems. (I say "to edit," but as mentioned in "The Big Announcement," Vol.9 No.3, my editing is done in harness with Stereophile's founder and guiding light, J. Gordon Holt.)

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