John Atkinson

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John Atkinson  |  Jan 14, 2008  |  0 comments
As I wrote in this space last month, test-equipment manufacturer Audio Precision has loaned Stereophile a sample of their top-of-the-line SYS2722 system, which has both significantly greater resolution and greater bandwidth than the Audio Precision System One Dual Domain we have been using since 1989. The reviews you can read in this issue include the first measurements I have performed with this impressive piece of gear, though there are still a number of graphs I produced using our System One. In fact, with the equipment I tested using the SYS2722, I performed duplicate sets of measurements using both the System One and the Miller Audio Research QC Suite in order to get a handle on how close the three systems agreed. (They did on the tests where the SYS2722's improved resolution was not a factor.)
John Atkinson  |  Jan 13, 2008  |  2 comments
I'd gone into the DCM room at the end of the day to hear the speaker manufacturer's new Time Frame TFE200 three-way tower, which can be seen at the left of the photo. Using two 6.5" woofers and a midrange mounted above the tweeter, the TFE200 offers a lot of speaker engineering for just $1000/pair. But following my audition of the speakers, driven by Jolida CD player and tube monoblocks, connected with Esoteric USA cables, we were treated to a concert by singer-songwriter Herman Hogan. Al Congdon, the VP of DCM parent company Mitek's Consumer Electronics Group, had heard Hogan playing in a Long Beach coffee house, and liked what he heard. He invited Hogan to perform in the DCM room at CES. You can't beat that live music!
John Atkinson  |  Jan 13, 2008  |  1 comments
At a press conference on the first day of CES, TEAC Esoteric launched a new range of source components. That was expected. But what was not expected was Esoteric's manager of overseas sales, Kazutaka Tsuda (above), introducing a new monoblock tube amplifier, the AT-100. Using KT88s in its output stage, the 50Wpc Esoteric amp features a new variable bias system and an output transformer using specially treated copper foil as the secondary winding to give the best coupling from the primary. The heaters of the input and driver tubes are DC-powered, to give the lowest noise; in fact, Esoteric claims the AT-100 is extremely quiet, despite its all-tube design. While it was designed as a power amplifier, a rear-panel switch, in conjunction with a volume control knob on its front panel, turns the AT-100 into an integrated, with three RCA inputs ands one XLR. Price will be $18,500.
John Atkinson  |  Jan 13, 2008  |  5 comments
In their suite at the Mirage, Nagra introduced the VPS (Valve Phono Stage), shown here under the Swiss company’s well-regarded PL-L line preamplifier. The front-panel switch selects between A and B inputs and mute, while the rear panel features two sets of inputs and outputs and an output level switch. The A inputs accommodate MC cartridges, while the optional B input can be set for either MM or MC operation. Capacitive and resistive loading can be changed with modules that plug into the pcb close to the input connectors. The MC circuit is based on high-quality transformers wound in-house by Nagra, followed by gain and RIAA stages using ECC81 and ECC83 tubes. The RIAA equalization can be set with internal jumpers either to the 1953 standard or to the 1976 standard. The circuit boards are mounted on compliant supports, to minimize microphony and the power supply is housed in a separate chassis. Unusually, the output can be taken either directly from the tube stage or via a solids-state buffer.
John Atkinson  |  Jan 13, 2008  |  3 comments
The Benchmark DAC1 D/A headphone amplifier has long been our affordable digital recommendation, both in its original form ($975) or with an additional USB data input ($1275, reviewed in the January issue of Stereophile). The DAC1 looked a little different when I went into the Benchmark room at the THE Show; "That's because you're looking at the new DAC1 PRE," explained Rory Rall. The NY company has added a pair of single-ended analog inputs so that the DAC1 can act as the system preamp. It still has digital inputs, of course, though the AES/EBU XLR had to be omitted to make the rear-panel real estate available for the analog inputs. A switch scrolls between the four digital inputs, the USB computer input, and the analog input. The DAC1 PRE is expected to begin shipping in February 2008 and will retail for $1575.
John Atkinson  |  Jan 12, 2008  |  1 comments
"What's new?" I asked the Canadian company's affable Lionel Goodfield on the last day of CES.
John Atkinson  |  Jan 12, 2008  |  0 comments
PBN's Peter Noerback had emailed me back in December about his new Montana KAS2 tower. The 300lb, 6'-tall speaker has twin 12" woofers top and bottom powered by a 1kW amplifier, with what appear to be top-of-the line 9" lower and 5" upper midrange units from SEAS flanking a 1.125" tweeter. An active, line-level bass extender, the Olympia EX, pushes the low-frequency extension below the resonance point of the woofers. Sensitivity is specified as a very high 93dB/W/m. The sealed cabinet features a solid-maple front baffle and is an asymmetrical hexagon in shape to minimize internal resonances. Price, considering the enormous size of the speaker, is a relatively realistic $38,000/pair, which includes the bass extender.
John Atkinson  |  Dec 30, 2007  |  0 comments
The world of loudspeaker aficionados has at one end most of us, who use multi-way box speakers of one kind of another; in the center are the lovers of panels, electrostatic, planar magnetics—it doesn't matter as much as the fact there is no box—and at the extreme other end are the lovers of high-sensitivity designs, where massive amounts of art, artifice, and loving care are applied to wrest full-range sound from a single drive-unit. Overcoming the daunting problems of getting a single drive-unit to work from 20Hz to 20kHz is, by those, felt to be outweighed by the benefits of not having a crossover circuit.
John Atkinson  |  Dec 17, 2007  |  1 comments
It was the strangest feeling: to be part of something yet without any understanding of how what I was doing fit into the whole. Back in the early 1980s, I had graduated from playing miscellaneous instruments in an early-music ensemble to devoting myself to the recorder (the end-blown fipple flute, not the audio archiving machine). My teacher, Nancy Winkelmann, had introduced me to various ensembles, and one Saturday afternoon, an ad hoc group of us was working with a composer of so-called "aleatoric" music; literally, music by chance.
John Atkinson  |  Dec 17, 2007  |  0 comments
It is the audio writer's nightmare that the combination of the large number of exhibitors at a Consumer Electronics Show and the very limited amount of time the Show's doors are open will lead him to miss the event's biggest story. I came close to living that nightmare last January, at the 2007 CES, when I realized that I had missed an entire floor of Las Vegas's Venetian Hotel. And it was, of course, the floor where, among other high-profile high-end companies, Sumiko was debuting the Cremona Elipsa from Italian speaker manufacturer Sonus Faber.

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