Robert Harley

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Robert Harley Posted: May 08, 2005 Published: Dec 08, 1993 0 comments
I feel privileged to have followed the remarkable evolution of digital processors over the past four-and-a-half years. Since my first digital review—a survey of three modified CD players back in August 1989—I've been fascinated by the developments that have inexorably improved the quality of digitally reproduced music.
Robert Harley Posted: Apr 10, 2005 Published: Jun 10, 1996 0 comments
All the action in digital playback for the past seven years has taken place in separate transports and digital processors. Nearly all high-end manufacturers have focused their skills on perfecting the individual elements of the digital playback chain—transports and processors—rather than on designing integrated CD players.
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Robert Harley Posted: Nov 05, 2004 Published: Oct 01, 1993 0 comments
I've watched from the sidelines with great interest the recent debate in this column over Home Theater (footnote 1) At one extreme is the suggestion that Stereophile begin reviewing video and Home Theater products. The other end of the spectrum was best expressed by John Atkinson at Stereophile's 1993 High-End Hi-Fi Show in San Francisco. Hearing the booming bass overflow of a Home Theater demonstration blasting down a hallway, he said, "They've brought televisions to our hi-fi show!"
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Robert Harley Posted: Jul 04, 2004 Published: Dec 01, 1990 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
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Robert Harley Posted: Jul 04, 2004 Published: Jan 01, 1992 0 comments
"How sour sweet music is
When time is broke and no proportion kept!"
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Robert Harley Posted: May 30, 2004 Published: Feb 01, 1992 0 comments
At the February 1991 Audio Engineering Society Convention in Paris, Audio Precision's Dr. Richard Cabot (see my interview in January 1991, Vol.14 No.1) proposed a new technique for measuring noise modulation in D/A converters (footnote 1). The method, based on psychoacoustic principles, attempts to predict the audible performance of D/A converters. Now that Stereophile has added digital-domain signal generation and analysis to our Audio Precision System One, we can employ Dr. Cabot's technique and see if there are any correlations with subjective performance.
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Robert Harley Posted: May 09, 2004 Published: May 01, 1990 2 comments
The promise of "perfect sound forever," successfully foisted on an unwitting public by the Compact Disc's promoters, at first seemed to put an end to the audiophile's inexorable need to tweak a playback system's front end at the point of information retrieval. Several factors contributed to the demise of tweaking during the period when CD players began replacing turntables as the primary front-end signal source. First, the binary nature (ones and zeros) of digital audio would apparently preclude variations in playback sound quality due to imperfections in the recording medium. Second, if CD's sound was indeed "perfect," how could digital tweaking improve on perfection? Finally, CD players and discs presented an enigma to audiophiles accustomed to the more easily understood concept of a stylus wiggling in a phonograph groove. These conditions created a climate in which it was assumed that nothing in the optical and mechanical systems of a CD player could affect digital playback's musicality.
Robert Harley Posted: Apr 25, 1997 0 comments
One of the fundamental tenets of high-end audio is that a loudspeaker's bass output should be appropriate for the listening room's size. The smaller the room, the less bass the loudspeakers should produce. Any manufacturer of large loudspeakers who has set up such a system in a CES hotel room can attest to how difficult it is to avoid boominess in a tiny space.
Robert Harley Posted: Apr 05, 1997 Published: Apr 06, 1997 0 comments
One of the fundamental tenets of high-end audio is that a loudspeaker's bass output should be appropriate for the listening room's size. The smaller the room, the less bass the loudspeakers should produce. Any manufacturer of large loudspeakers who has set up such a system in a CES hotel room can attest to how difficult it is to avoid boominess in a tiny space.
Robert Harley Posted: Jul 25, 1996 0 comments
Let's say you play a CD on a poor-quality CD transport and store the digital audio data in a massive computer memory. You then repeat the process, but this time play the CD into the memory from the finest CD transport extant (say, the Mark Levinson No.31). A week later you feed the two sets of data from the massive memory into a digital processor and listen to the music. Would the CD transports' sonic signatures be removed from the signal? Could you hear a difference between the transports a week later?

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