High Definition Compatible Digital
<I>"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."</I>—Anna Case, Metropolitan Opera Soprano, 1915
Robert Harley
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Mark Levinson No.38 preamplifier
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.
Krell KPS-20i CD player
The Krell KPS-20<I>i</I> (KPS stands for "Krell Playback System") is essentially a CD transport and digital processor in one chassis. What make the KPS-20<I>i</I> different from a CD player are the unit's five digital inputs, which allow the KPS-20<I>i</I> to function as a digital/analog converter for external digital sources.
A Matter of Measurements
Beginning with this issue, <I>Stereophile</I> 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, <I>Stereophile</I> 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.
It's Only Hi-Fi!
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 <I>really</I> 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.
Digital Data Compression: Music's Procrustean Bed
<B>Procrustean bed</B>: <I>a scheme or pattern into which something or someone is arbitrarily forced</I>.<BR>
<B>Procrustes</B>: <I>a villainous son of Poseidon in Greek myth who forces travelers to fit into his bed by stretching their bodies or cutting off their legs.</I>—Webster's Ninth New Collegiate Dictionary
Were Those Ears So Golden? (DCC & PASC)
The whole field of subjective audio reviewing—listening to a piece of equipment to determine its characteristics and worth—is predicated on the idea that human perception is not only far more sensitive than measurement devices, but far more <I>important</I> than the numbers generated by "objective" testing. Subjective evaluation of audio equipment, however, is often dismissed as meaningless by the scientific audio community. A frequent objection is the lack of thousands upon thousands of rigidly controlled clinical trials. Consequently, conclusions reached by subjective means are considered unreliable because of the anecdotal nature of listening impressions. The scientific audio community demands rigorous, controlled, blind testing with many trials before any conclusions can be drawn. Furthermore, any claimed abilities to discriminate sonically that are not provable under blind testing conditions are considered products of the listeners' imaginations. Audible differences are said to be real only if their existence can be proved by such "scientific" procedures (footnote 1).
Triad Design System Seven satellite/subwoofer loudspeaker
Triad Speakers has been designing and manufacturing three-piece (woofer and two satellites) loudspeaker systems since 1982. The company was formed that year by designer Larry Pexton and has enjoyed steady growth in their market niche. Their original three-piece loudspeaker was a collaboration with Edward M. Long, of "Time-Align" fame, and Ron Wickersham. It was felt that the ideal loudspeaker would have the least cabinet interference, thus the design decision to keep the woofer separate and the midrange/tweeter enclosure small. Triad speakers were selected for inclusion in the Consumer Electronics Show's Innovations 1990 Design and Engineering Showcase, the sixth time the company's products have been selected for this award.
Mark Levinson No.31 Reference CD transport
At a "Meet the Designers" panel discussion at the 1992 Los Angeles <I>Stereophile</I> High-End Hi-Fi Show, I asked a group of successful digital designers (footnote 1) each to state how much of a digital front end's sound quality they believed was due to the transport, digital processor, and interface between the two. There was virtual unanimity: Nearly everyone agreed that a digital processor accounts for about 50% of a digital source's sound quality, the transport 30%, and interface 20%.
Expressive Technologies SU-1 moving-coil step-up transformer
What's this? A review of a $3000 moving-coil step-up transformer in this digital day and age? Yep. Although the market for such a product is small, the fact that the Expressive Technologies SU-1 step-up transformer enters previously uncharted state-of-the-art territory warrants these pages of editorial space. Furthermore, LP playback appears to be alive and well at the upper end of the high-end spectrum, a market segment addressed by the SU-1 (footnote 1).