Thomas J. Norton

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Thomas J. Norton Posted: Aug 28, 2014 6 comments
In the late 1980s, KEF, then as now a leader in bringing new technology to loudspeaker design, developed a unique coincident driver that positioned the tweeter in the throat of the midrange/woofer cone. In a flash of inspiration, they dubbed it the Uni-Q, and the driver immediately not only found its way into the company's more upscale speaker designs, but also became a key element in a major European research project on room acoustics. That study's results appear to have been inconclusive, but the Uni-Q lives on as the defining element of KEF loudspeakers.
Thomas J. Norton Posted: Mar 17, 1996 0 comments
The Model Four is the largest model in KEF's current Reference series of loudspeakers, discounting the R107/2 Raymond Cooke Special-Edition (reviewed in a follow-up in October '95). It's also the largest KEF model that uses their Uni-Q® loudspeaker configuration. When I visited the KEF factory last October with a group of audio journalists from the US, KEF emphasized the importance of Uni-Q technology to their future plans. They consider it proprietary, and intend to enforce the worldwide patents they hold on the design. One look at KEF's current line will be enough to tell you why they're so serious. Uni-Q drivers may be found not only in most of the Reference series, but in most of their other models as well. The most significant exceptions: the Raymond Cooke series, a few inexpensive models, and their THX-certified loudspeaker system.
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Thomas J. Norton Posted: Oct 07, 2007 Published: Mar 07, 1990 0 comments
Since he joined Snell Acoustics in the mid-1980s, Kevin Voecks, their chief designer (footnote 1), has been involved in the design or redesign of the entire Snell line, from the minor revision of the Type A/III (incorporation of a new tweeter), to the complete redesign of the Type C (now the CIII). Snell Acoustics is located in Massachusetts, and although Kevin spends a good deal of time there or at the measurement and analysis facilities of the Canadian National Research Council (NRC) in Ottawa, he does a great deal of his conceptual and preliminary design work, as well as his listening, in Los Angeles, where he makes his home. I visited him there last summer to gather a little insight into his background and loudspeaker design philosophy. I started by asking Kevin when had he first become interested in loudspeaker design...
Thomas J. Norton Posted: Mar 08, 1998 0 comments
Kinergetics Research was a name to be reckoned with in the early days of CD, when they produced some of the earliest well-received, audiophile-grade CD players. They've branched out since then, producing amplifiers, preamps, subwoofers, and surround-sound processors. In fact, they're so busy with such products that they no longer build CD players! The last Stereophile review of a Kinergetics CD player appeared way back in 1993.
John Atkinson Thomas J. Norton Posted: Aug 07, 2005 Published: Jan 07, 1990 0 comments
A strange disguise; still, write it down,
it might be read. Nothing's better left unsaid.
—Keith Reid
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Thomas J. Norton Posted: Aug 03, 2010 Published: Dec 03, 1992 1 comments
Love 'em or hate 'em, headphones serve a purpose. My first headphones were Kosses, and they were perfect for use in a college dorm. While I've always owned a pair or more over the years, somehow they never became my primary mode of listening, except in situations where using loudspeakers at satisfying levels risked eviction, bodily harm, or both.
Thomas J. Norton Posted: Nov 08, 2010 Published: Jan 08, 1994 0 comments
Compared to the Krell KSA-300S power amplifier that I also review this month, the KRC preamp's design is, at first glance, almost conventional. But its thoroughly high-end internal design has been equally well thought-out and executed. Its main, four-layer, glass-epoxy circuit board is for the audio signal, DC power, and ground—two layers for the latter are said to minimize noise. The gain stages are pure class-A and complementary. As in the amplifier, the circuit is direct-coupled, with servo circuits controlling the DC offset. The fully regulated power supply is housed in an external chassis. Seven inputs are provided: four single-ended, two balanced, and one single-ended tape. All inputs are line-level except for the optional, single-ended phono stage. (This review will address the line stages; a Follow-Up will discuss the phono stage's operation.) There are three outputs: balanced and single-ended main outputs, and a single-ended tape output.
Thomas J. Norton Posted: Oct 01, 2010 Published: Jan 01, 1994 0 comments
It was a dark and stormy night. A biting, cold wind cut through Sam's skimpy jacket; ice crystals clung tenaciously to his bushy moustache. As he approached his front door, visions of a toasty-warm, Krell-heated listening room softened the chill. He could feel the glow already; his Krell amp had been on all day, awaiting his return.
Thomas J. Norton Posted: Mar 29, 2012 Published: Nov 01, 1993 0 comments
When a manufacturer sets out to design and build a product, be it in high-end audio or any other field, the final retail price is usually a prime consideration. Parts and assembly are only part of the equation; there also must be enough buyers to amortize the design and development costs. If the product is to be a flagship model—something a company hopes will give a lift to its entire line—engineers will sometimes throw caution to the winds, designing a product without thought to its ultimate price, which is only set after the design is complete. When Madrigal Audio Laboratories set out to design their No.30 Reference Digital Processor, they appear to have chosen exactly this approach.
Thomas J. Norton Posted: Jan 25, 1997 0 comments
We are now well past the era in which every review of digital playback equipment had to begin with an apology for the medium. CD replay performance may, in fact, now be bumping up against a glass ceiling. But that doesn't discourage high-end audio manufacturers from trying to advance the art, and tempt audiophiles (at least those among us who are not hopeless digiphobes) out of our minds.

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