John Atkinson

"Nothing is too wonderful to be true, if it be consistent with the laws of nature . . ."—Michael Faraday

"When a true genius appears in the world you may know him by this sign: that all the dunces are in confederacy against him."—Jonathan Swift

Eminent Technology’s Bruce Thigpen has always taken an interesting slant on how to design audio products—his air-bearing tonearm was one of the best-sounding back in the day and his push-pull planar magnetic speakers are thought by some to be unbeatable. But at THE Show, held next door to the official CEDIA venue, the Convention Center, in the Denver Athletic Club, Bruce was showing off his infrasonic subwoofer. Yes, that’s a fan, which rotates at a constant 800rpm. The wrinkle is that the audio signal is used to vary the pitch of the fan blades. Feathered with no signal, when driven with audio the twisting blades produce a massive acoustic wave with very little power input. The bandwidth is limited by the fan speed to below 30Hz or so—you have to rotate it faster to reproduce higher frequencies but then its self noise increases rapidly— but it will reproduce frequencies as low as 1Hz with a very high spl.

Looking at the ginormous horn speakers in the Silbatone room, all I could think was "how did they get them through the door?" The speakers were a hybrid, the lower half being vintage Western Electric with field-coil–energized 18" woofers, and the midrange and highs being modern recreations from GIP in Japan.

I hadn't been aware of the Silbatone brand before this CES. Their website says that "The goal of Silbatone Acoustics is to recreate the musical enjoyment of the great theater systems in the home, creating practical realizations for today's serious music listeners." Okay. It turns out that their beautifully constructed power amplifiers ($150,000, depending on tube choice) are vehicles for unusual and rare tubes. The amplifier seen in front of the speakers, for example, used square-base Marconi DA100 broadcast modulation tubes (around $5000 each) for the outputs, with pre-WWII Siemens ED red-base tubes as the drivers. The audiophile air in this room was rarefied, indeed.

Loudspeaker manufacturer VMPS ran a series of live-vsrecorded dems throughout the four days of CES, at the Zeus Ballroom in T.H.E. Show's Alexis Park venue. In dems organized by VMPS's Brian Cheney, groups of musicians and singers first performed live while being recorded by some of Ray Kimber's staff in DSD, using crossed figure-8 mikes, Millennia Media mike preamps, and Meitner converters. The recording was then played back on VMPS speakers and subwoofers, driven by Ampzilla amplification, with Audience Adept Response power conditioning and Audience Au24 e cables. The playback level was matched to that of the original, allowing legitimate comparisons. (The mikes were close enough in the solo singer dem I witnessed to minimize the double contribution of the room acoustic.)