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Larry Greenhill Posted: Oct 16, 2001 0 comments
It was a late Friday afternoon in May and I wasn't having much luck getting into Sony's multichannel SACD demo room at the Home Entertainment 2001 Show. Surely, as a member of the audio press and a freelance writer for Stereophile, I should have no trouble. Not this time. After several polite "Nos," a Sony consultant managed to snare for me the last ticket of the day.
Larry Greenhill Posted: Nov 03, 2001 0 comments
Sony describes the $700 TA-P9000ES as "a pure audio multichannel preamplifier equipped with two inputs for 5.1 analog multichannel audio sources, enabling selection, volume control, and amplification." A relay with twin gold-plated crossbars switches the two six-channel sources. Then follows a class-A solid-state push-pull amplifier in discrete configuration. Separate transistors, resistors, and capacitors populate the printed circuit boards. An oxygen-free copper shield surrounds each channel to prevent crosstalk between the channels. In addition, there is a relay-controlled gain stage offering 0, +6, and +12dB amplification.
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Larry Greenhill Posted: Jan 15, 2013 0 comments
At the 2012 CES, Soulution Audio's Cyrill Hamer introduced me to the Swiss company's reference line of 700 monoblock amplifier ($130,000/pair) and the dual-mono, dual-differential 710 stereo (now $55,000) amplifier Michael Fremer reviewed and liked so much in August 2011. At this year's CES, Soulution presented its less-expensive 500 line. While keeping the same appearance as the Reference line, the 500 line features different internal designs, including the company's first integrated amplifier, the 530 integrated preamplifier/amplifier ($49,000).
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Larry Greenhill Posted: Jan 16, 2012 1 comments
Soulution Audio's Cyrill Hammer was on hand to discuss the company's "small" Soulution 501 mono Amplifier ($55,000/pair). Similar in design to the Soulution 710 stereo amplifier that had so impressed Michael Fremer in the August 2012 issue of Stereophile, the more diminutive 501 monoblock amplifier is rated at 125W into 8 ohms, utilizes six switching-mode power supplies, and features a high-bandwidth, zero-feedback voltage-amplification input stage. Unlike the 176 lb Soulution 710 stereo amplifier that required three good men to move into Mikey's listening room, the 501 weighs in at a "mere" 80 lbs per chassis.
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Larry Greenhill Posted: Jan 06, 2006 2 comments
Soundsmith introduced a strain-gauge cartridge system in the Joseph Audio room at the Alexis Villas. The output of the dedicated battery-powered preamplifier can be fed to a preamp's line input as it does not require any equalization.
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Larry Greenhill Jason Victor Serinus Posted: Jan 14, 2013 0 comments
English manufacturer Chord Electronics is known for its sophisticated CD players, which use sophisticated DACs. Indeed there was a huge picture denoting Chord's latest-generation DAC, the QBD 76, at the center of the back wall. As my beat was amplifiers, Chord's designer, John Franks (pictured above), spent the next 30 minutes walking me through the design of Chord's latest amplifier, the SPM 1200 Mk.II ($14,000), a solid-state, 350Wpc stereo mode. The amplifier sits at the bottom of the short stack of audio equipment John is leaning on. He explained that the amplifier has a high-frequency, 2kW, switch-mode power supply, and uses an output stage based on dual-die, lateral-structure MOSFETs with a soft turn/on-turn/off characteristic. This allowed John to use a sliding class-AB design.
Larry Greenhill Thomas J. Norton Posted: Sep 02, 2010 Published: Oct 02, 1984 0 comments
James Bongiorno, the engineer behind the Sumo Andromeda, has enjoyed a long and colorful career as an audio amplifier designer. He has cast himself at times as an enfant terrible, exploding at audio critics and running scandalous advertisements (footnote 1). His best-known amplifier is the Ampzilla, produced by Great American Sound, but he also designed the Dyna 400. Currently Jim is living on a boat and serving as part-time consultant to the Sumo Company.
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Larry Greenhill Posted: Aug 20, 2008 0 comments
With the popularity of home-theater systems, subwoofers have proliferated. Because multichannel AV receivers are designed to provide a properly filtered, line-level subwoofer, or low-frequency effects (LFE) signal, many subs no longer come with built-in high- and low-pass filters for insertion into two-channel audio systems. However, the PB13-Ultra subwoofer from SV Sound does include these, which is what piqued my interest in it. After Ed Mullen, SV Sound's director of sales, assured me that the PB13-Ultra was capable of reproducing solid 20Hz organ-pedal notes in my listening room, I asked for one to review.
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Larry Greenhill Posted: Jan 04, 2015 1 comments
As an audiophile, I've come to associate the size, weight, and price of a subwoofer as quick'n'dirty indicators of its quality. The subwoofers that have worked best in my large listening room—the Velodyne ULD-18 and DD-18+, Muse Model 18, REL Studio III, JL Audio Fathom f113, and Revel Sub30—each weigh more than 130 lbs and cost more than $2500. With some of my reference recordings, all of them have achieved what Robert Harley described in the April 1991 issue of Stereophile as the goals of a quality subwoofer: "seamless integration, quickness, no bloat, and unbelievable bass extension." Yet are back-busting weight, unmanageable size, and nosebleed cost essential to achieving those goals?
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Larry Greenhill Posted: Jan 12, 2008 0 comments
"We don't have a price yet, because the TAD Compact Reference One Monitor loudspeaker is a prototype," stated Andrew Jones, lead engineer for loudspeakers at TAD Laboratories, Inc., shown here in John Atkinson's photo. "I can say that it will be somewhere between zero dollars and $60,000, the cost of a pair of our full-sized TAD Reference One speakers."

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