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TAC (December 1, 2009): The Accucoustics website is currently offline.
Accucoustics web site (June 29, 2005): In 1968, I acquired a deep interest in and love of the pipe organ. I got my first exposure to the intricacies of such an instrument during that year when a large instrument was being installed in Corbett Auditorium on the campus of the University of Cincinnati.
Between 1974-1982 I got the opportunity to work on a large Wurlitzer theatre pipe organ being installed at Emery Theatre in Cincinnati, OH. Being in electronic engineering, I decided to apply my knowledge of test methods and procedures to perform a four year independent research project on the subject of Flue Pipe Acoustics, the study of the Physics behind the Sound of Organ Pipes and Whistles.
That research culminated in a number of domestic and foreign patents on two entirely new classes of whistles of extremely high efficiency and output, known as toroidal whistles, suitable as replacements for DES warning sirens. That is somewhat of a different story and can be found in my sister website entitled "Flue Pipe Acoustics".
I had spent the next 15+ years searching for loudspeakers which could do justice to the low frequency reproduction requirements for the pipe organ. The bass of most existing woofers and subwoofers have most of their output in the 50 Hz-70 Hz range. It is rare to find any loudspeaker which can maintain its full output to 30 Hz or below with low distortion. This is the type of bass extension I had been searching for in a loudspeaker, but have been unable to find without spending a small fortune.
Within the past several years I decided to apply my findings on my research toward the design of transmission line (TL) loudspeakers of higher efficiency. A TL loudspeaker is basically a pipe coupled to a small chamber behind the woofer. During this time I collaborated with my friend and associate, Todd Birdsong to build some VLR-4 prototypes using a 10" woofer. VLR stands for Very Low Resonance and the suffix stands for the enclosure volume in cubic feet.
The prototypes were awesome on all types of music and reproduced sounds normally only heard during live performances or in high end loudspeakers selling for several thousand dollars a pair. Our business started from this.