Show Report

Rocky Mountain Audio Fest

Held in Denver, Colorado, September 30 - October 2, 2005

October, 2005

John E. Johnson, Jr. and Cynthia B. Johnson


Page 37

The coolest product at the show was this Eminent Technology unit that produces 110 dB at 10 Hz. It is designed to supplement subwoofers (!!!) in the 5 Hz to 20 Hz range. A 1/3 horse power motor turns the fan blades, which are connected to a rod in the center of a woofer voice coil. Instead of the voice coil moving a cone, it moves the rod, which then moves smaller rods that adjust the pitch of the fan blades. So, the high velocity air coming from the fan is pulsed at the low frequencies. It only takes about 100 watts of amplifier power to drive it. The entire room shook, and the door was opening and closing in time with the signal. All this, and there was almost no distortion (the ET rep had the response being plotted on a spectrum analyzer during the demonstration). They calculated that it would take ten 18" subwoofers to produce this level of sound. It has to be placed in a separate room due to the fan noise, and putting it in the attic would work fine. The opening into your home theater would be about 2'x4' in the ceiling. These are prototypes at this point. All I know is I want one.

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