November 2006 Meeting
Date: Sunday, November 19, 2006
Time: 6:00 PM
Place: Boston University, 25 Cummington St., 1st Floor Conference Room,
Boston, MA 02215
Featured Guest: Justus Verhagen, PhD
Ribbon Loudspeakers - Construction, History, and their Advantages
Justus Verhagen is a post-doctoral research biologist
at Boston University. He has a keen interest in ribbon loudspeakers and
has built many. His efforts culminated in a novel design of a line-source,
dipolar ribbon speaker, which is easy to build, adaptable with various configurations,
and incorporates electronic equalization. Dr. Verhagen was born and raised
in Holland. He received his doctorate from the University of Delaware, 2000.
Essentially an autodidact in audio engineering, his
use of audio engineering principles reflects an evolution of many years
of research: from nearly uninformed trial-and-error to later employing modern
acoustical, electrical equivalent models, and finite element tools. This
was paralleled by building a personal library of over 20 books and over
200 articles and patents on audio engineering. His book, "Ribbon Loudspeakers:
Theory and Construction," represents perhaps the definitive textbook
on ribbon loudspeakers. Pictures and a description of the Quad and the Celestion
3000 ribbon loudspeakers are presented in his book. Order forms for his
book will be available at the meeting.
His formal training encompasses biology, psychology,
and neuroscience. He has published 14 articles to date and presented many
posters and slide shows on the neuro-physiological basis of flavor perception,
free radicals, and disease. If the audience is interested, Justus will discuss
some of his recent findings on how sniffing implements an adaptive neural
filter on odor representations in the rat brain.
After the meeting, a portion of Ira Leonard's 5,000
CDs will be available for sale. The CDs consists of about 80% Jazz while
the balance is mostly classical. The costs range is $0.50-$1.00 each. Most
are not open. All proceeds from the CD sale go to the BAS treasury.