Past meetings of the Society
November 2006

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
(617) 271-6588

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.


The Boston Audio Society
PO BOX 260211
Boston MA 02126

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updated 12/5/06