Robert Harley

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Robert Harley Posted: Aug 07, 2009 Published: Dec 07, 1990 0 comments
I find it more than a little ironic that in 1990 the only two digital-to-analog converters to employ a new state-of-the-art DAC also use vacuum tubes. Many in the audio community consider tubes an anachronism, and find it surprising and humorous that they are still used in newly designed audio products. The fact remains, however, that these two tubed digital processors achieve the best digital playback currently available—and by a wide margin. Moreover, their respective designers' technical savvy and passion for building leading-edge products is reflected in their choice of these superlative and very expensive new DACs. Is it mere coincidence that both designers also chose vacuum tubes to realize their vision of no-compromise digital playback?
Robert Harley Posted: Jun 08, 2009 Published: Dec 08, 1990 0 comments
The whole idea that different CD transports have different sonic characteristics when driving the same digital-to-analog converter is a vexing problem. It is easy to prove that even the cheapest CD players recover the data stored on most CDs with bit-for-bit accuracy, thus disproving the widespread and erroneous belief that errors in the digital code are commonplace and affect presentation aspects such as imaging, soundstage depth, textural liquidity, etc (footnote 1). If the datastream driving the digital converter is comprised of the same sequence of ones and zeros, regardless of the transport, what other factors could account for the sonic differences between CD drives reported by many listeners?
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Robert Harley Posted: Jun 04, 2009 Published: Mar 04, 1992 0 comments
"Experience which is not valued is not experienced....Value is at the very front of the empirical procession."—Robert M. Pirsig, Lila
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Robert Harley Posted: May 29, 2009 Published: Nov 01, 1992 0 comments
Audiophiles constantly seek ways to improve the experience of hearing reproduced music. Preamps are upgraded, digital processors are compared, turntables are tweaked, loudspeaker cables are auditioned, dealers are visited, and, yes, magazines are read—all in the quest to get just a little closer to the music.
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Robert Harley Posted: May 29, 2009 Published: Jun 01, 1991 0 comments
As founder of California-based Vacuum Tube Logic of America, David Manley is at the forefront of the current renaissance in vacuum-tube audio equipment. In addition to manufacturing some highly regarded audiophile components, VTL has introduced a line of tubed professional equipment that is finding its way into recording studios. David has a lifetime of experience in tube electronics, recording studio design, disc cutting, music recording, and most recently, analog/digital and digital/analog converter design.
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Robert Harley Posted: May 01, 2009 Published: Jan 01, 1993 0 comments
"Everybody, including myself, was astonished to find that it was impossible to distinguish between my own voice, and Mr. Edison's re-creation of it."—Anna Case, Metropolitan Opera Soprano, 1915
Robert Harley Posted: Apr 03, 2009 Published: Aug 03, 1994 0 comments
High-end audio companies take different approaches to staying successful. One way to maintain a market position is to continue improving fundamental designs, offering a little higher sonic performance with each model. The latest products from a company employing this approach will look and operate very much like their first products.
Robert Harley Posted: Apr 03, 2009 Published: Apr 03, 1995 0 comments
The Krell KPS-20i (KPS stands for "Krell Playback System") is essentially a CD transport and digital processor in one chassis. What make the KPS-20i different from a CD player are the unit's five digital inputs, which allow the KPS-20i to function as a digital/analog converter for external digital sources.
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Robert Harley Posted: Mar 25, 2009 Published: Sep 25, 1989 0 comments
Beginning with this issue, Stereophile readers will notice that more of the subjective equipment reviews are augmented with technical reports describing certain aspects of the component's measured performance. Although test data have lately been increasingly included in reviews, Stereophile has recently made a major commitment to providing readers with relevant measurements of products under review. We have just finished building an audio test laboratory featuring the Audio Precision System One, a sophisticated, computer-based audio test measurement system.
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Robert Harley Posted: Mar 22, 2009 Published: May 22, 1993 0 comments
When I taught a recording engineering program at a California college, one of my first responsibilities to new students was to clarify for them what recording engineering was really about. Many of them entered the program with the impression that recording was nonstop glamor, with a significant part of the job devoted to partying with their favorite rock bands. It was my job to tell them the bad news: Recording was more about lying on your back underneath a recording console on a dirty studio floor with hot solder dripping on your face.

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