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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 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 16, 2012 0 comments
Luke Manley and Bea Lam of VTL were on hand as host and hostess at the VTL exhibit suite at the Venetian Hotel to present their two new stereo tube amplifiers, the $33,500, 400Wpc S400 Series II amplifier, and the $10,000, 200Wpc S200 Stereo Signature amplifier shown in the photo. Although the S400 was configured into a floorstanding tower and the S200 in the rack-mounted chassis used for their MB-450 monoblock amplifier, both new products feature VTL's latest tube technology, including fully balanced, differential input stage, VTL's SmartTube technology with automatic bias and screen supply adjustments and fault sensing, and a new user-adjustable damping factor feedback control. The feedback loop amount can be precisely set to suite the listener's taste via three-position switches located between the input tubes on the top of the chassis.
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Larry Greenhill Posted: Jan 16, 2012 0 comments
I visited Burmester's President, Dieter Burmester, in the German company's Venetian Hotel Suite. As well as high-end audio products Burmester also manufactures high-perfomance music systems for the Bugatti Veyron and Porsche sports cars. I mentioned that I saw Dieter's likeness in a sketch for an interview with him and Richard Chailly that appears in the latest Christophorus, the Porsche's owner's magazine. That led to chat about our favorite automobiles, and from there to high-end audio. Dieter hopes putting high-end audio in the Porsche Panamera and 911 automobiles will introduce high-end audio to a younger but affluent generation now focused on limited-fidelity MP3 on their iPods.
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Larry Greenhill Posted: Jan 13, 2012 0 comments
Pass Labs’ engineer Wayne Colburn insisted that the name of their latest amplifier, the Xs, was not a pun. He spent over an hour detailing the 3-year design project that culminated in the company's $85,000/pair, solid-state, two-chassis-per-channel, class-A amplifier. Leaning on the 4.5-foot stack of the amplifier's stereo configuration, Wayne spoke about how the design was based on the results of an examination of transfer characteristics of a diverse set of gain devices, including tubes and SITs (silicon-carbide devices that are exclusive, we believe, to Pass Labs for use in audio). The output stage was designed to reproduce the transfer characteristics preferred by a panel of listeners, who lived with a variety of different output stages for a lengthy period of time.
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Larry Greenhill Posted: Jan 13, 2012 0 comments
Ypsilon's Demetrius Baklavas (right in photo) and Ypsilon's US distributor, Brian Ackerman of AAImports, demonstrated the Aelius amplifier to John Atkinson (left) and myself—the amplifiers were doing a fine job of producing dynamics and superb open highs from the plasma tweeters of the new, floorstanding Lansche 7 loudspeakers.
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Larry Greenhill Posted: Jan 13, 2012 0 comments
UrbanEar's Andrea Miles models their new mustard-colored Platten headphones, which list at $65. This was part of the great upsurge in headphone exhibits found in the South Hall of the Las Vegas Convention Center, or the "Zoo."
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Larry Greenhill Posted: Jan 13, 2012 2 comments
Ypsilon Electronics’ Demetrius Baklavas designed the new $36,000/pair Aelius monoblock amplifier. The Aelius is rated at 220W into 8 ohms, 308W into 4 ohms, and 500W into 2 ohms. It is a hybrid design that features tube inputs, hand-wound interstage coupling transformers, and MOSFET output devices wired in the same type of push-pull Circlotron output configuration that was found in some Output-Transformer-Less tube (OTL) designs. The Circlotron configuration was developed years ago by Electro-Voice, and while the Aelius's output devices are all N-channel MOSFETs, the Circlotron approach is very different from conventional quasi-complementary approaches.
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Larry Greenhill Posted: Jan 13, 2012 0 comments
JL Audio's home high-end audio subwoofer engineer, Brett Hanes, proudly shows off the company's new $1700 ES-112 subwoofer (wood finish) that uses clever engineering principles to coax better performance and value from a less-expensive product. The ES-112's woofer features the company's only dual-spider driver construction, a smaller voice-coil, though the cone is designed for the same 3" peak–peak excursions found in the company's flagship f212 and Gotham models. Other construction simplifications—you change line input voltage by changing fuses in external fuse holder—make the product more adaptable for international sales. It also has a high-pass output with variable frequency crossover, which will be appreciated by those of us using subwoofers in a two-channel home audio system.
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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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