TRW-17 transducer $12,900.00
Motor Controller $450.00
BT-42 Amplifier and crossover $1050.00
Design and installation, typical $8,000-$12,000*
Total $21,950-$25,950Rotary Subwoofer:
"In the early 1970s, researchers noted that while humans could detect frequencies below 20 Hz, the ear was much less sensitive to these frequencies. As a result, increased sound pressure levels are required to perceive these sounds. These frequencies are often not audible but still subliminally detected by humans (see: Infrasound). Typical subwoofers using moving cones do not transmit energy very well to the air below 20 Hz, and thus their sound pressure level (SPL) falls off significantly below this frequency.
To help people to perceive the very low frequency content available in recorded material, Bruce Thigpen of Eminent Technology experimented with new methods of producing the required SPL. The rotary woofer displaces far more air than is possible using moving cones, which makes very-low frequency reproduction possible."
"In 1985 Eminent Technology began developing planar magnetic loudspeakers and in 1987 introduced the world's first full range push-pull planar magnetic loudspeaker, the LFT-3. Another of the company's products is the so-called Thigpen Rotary Woofer."
The point, the rotary subwoofer is developed technology.
2008: Niagra's Fury
uses six rotary subwoofers.
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