Larry Greenhill

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Larry Greenhill Posted: Jan 16, 2012 0 comments
It was good to visit McIntosh Laboratory's 35th floor suite at the Venetian Hotel and spend a few minutes with Ron Cornelius, the product manager, discussing our shared experiences with the legendary McIntosh MR-78 FM tuner. Ron showed me the latest iteration of the company's MC-275 tube amplifier. Now released as version 6, 50th-Anniversary 275, priced at $6500, it reminded me that the amplifier was first shipped in 1961.
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Larry Greenhill Posted: Jan 16, 2012 0 comments
Ron Sutherland had a rack of his components at CES to drive Vandersteen Quatro floorstanding loudspeakers. The rack consisted of the two monophonic Phono Block phono preamplifiers, recently reviewed by Brian Damkroger in Stereophile; the $15,000 Destination Line Stage (one non-audio signal carrying control unit with Nixie tubes, and one audio chassis for each channel); and the $10,000/pair, 200W monoblock power amplifiers. Except for the amplifier and control chassis, most of these units are configured into two side-by-side subunits—one for power supply and one for audio signal—attached only by front and rear panels.
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Larry Greenhill Posted: Jan 16, 2012 1 comments
The $25,000, 500W Mark Levinson No.53 digital-switching reference monoblock amplifier made its regular non-playing appearance at CES 2012 but this time with an illuminated cutaway display, allowing its lead design engineer, Mark Seiber, to walk me through its circuitry. The transparent panel, which the display used in place of heatsinks allowed me to easily see the No.53's four major subsections (analog input stage, modulation, amplifier output stage with its eight air-core inductors, and power supply section, which is at the bottom of the chassis.
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Larry Greenhill Posted: Jan 16, 2012 0 comments
Harman Specialty Audio introduced the new Revel Performa 3 series of loudspeakers at the 2012 CES. Kevin Voecks, lead audio engineer in the design, was delighted at the increased performance of Performa 3 series, including the $4500/pair, three-way, F208 full-range floorstander and the $1750/pair M106 two-way bookshelf. The F208 replaces the more expensive, $7500 F32 Performa in the previous series.
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Larry Greenhill Posted: Jan 16, 2012 0 comments
Sumiko teamed up a pair of Sonus Faber Amati Futura floorstanding speakers — watch for JA's review in the March 2012 issue—with the $4500 REL Gibraltar G1 subwoofer to produce explosive, massive, but tightly controlled bass while playing the "Chinese Drum Poem" selection from disc 3 of the Burmester Demonstration Disc series. The REL G1 is a 108 lb, closed-box, front-firing 12" driver driven by a 600W, high-current amplifier. Sumiko's John Hunter set the gain of the G1 using a small remote. The G1 subwoofer fell totally silent when the music was free of deep bass content, as it should.
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Larry Greenhill Posted: Jan 16, 2012 0 comments
Brent Hefley, Marketing Manager of Ayre, walked me through the circuit layout of Ayre's newest amplifier, the $14,950, dual-mono, 200Wpc (8 ohms) VX-R. Based on the well-regarded and long-established MX-R monoblock and introduced at the 2011 CES, the VX-R uses Ayre's ultra-fast printed circuit board materials. Ayre is expecting great things, Brent told JA, from its recent hiring of ex-Classé and Linn engineer Alan Clark, who joins Charlie Hansen and Ariel Brown as the Colorado company's creative engine.
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Larry Greenhill Posted: Jan 16, 2012 1 comments
Not to be outdone by the audiophile crowd, an auto sound manufacturer displayed a huge metallic woofer that dangled from a crane. (The crane could be set to lift loads between 500 lbs and 3 tons.) I thought I had seen everything, but the North Hall of the Las Vegas Convention Center never disappoints!
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Larry Greenhill Posted: Jan 16, 2012 1 comments
The Audio Power Labs exhibit took my breath away, Imagine, a huge, beautiful $175,000 per pair, 200Wpc monoblock tube amplifier using 833C, graphite-plate, radio-frequency transmitter tubes that have a bandwidth of 30MHz and run with 1500V on the plates! These tubes were used in the output stage of BCF-1 radio transmitters. Now imagine that the amplifier's designers are named Squeek Rieker (right) and Peeya Iwagoshi (left), and you know why I had to pinch myself to make sure I wasn't dreaming.
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Larry Greenhill Posted: Jan 13, 2012 0 comments
Each Xs channel has two chassis, one for the power supply and the other for signal amplification. The amplifier acts as a voltage source, and is rated at 300W into 8 ohms, 600W into 4 ohms, and 1200W into 2 ohms. It is biased to ensure make certain that the amplifier remains in class-A mode into all loads. Each channel has 122 output devices with a total rating of 10kW, and the extensive heatsinking allows the Xs 300 to deliver 2kW into a load "all day long." Though the Xs 300 stack was a silent exhibit, the company was using the more modest $65,000/pair Xs 150s to drive the Pass Lab RM2 loudspeakers, which showed a wide dynamic range and outstanding detailing.
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Larry Greenhill Posted: Jan 13, 2012 0 comments
Audio Research's Chris Ossanna proudly shows off the company's new $25,000/pair, two-chassis Reference 250 monoblocks, which employ the new KT-120 output tube. This amplifier has 50% more power-supply capacitance than their previous flagship, the Reference Anniversary 110, and uses the same type of Teflon coupling capacitors they sourced for their Reference Anniversary preamplifier. The front panel metering allows the consumer to check the bias and to adjust the speed of their response to either fast or slow.

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