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Section 1: THE MOVING COIL DRIVER
Cone surround Cone Materials Cone Resonance Delayed Resonance The Coil Effects of Heat The Magnet Dedicated Drivers Disadvantages Co-Axial Drivers Controlled Flexure Cone Velocity and Radiation Resistance Doppler Effect The Tweeter Phasing
Section 2: ALTERNATIVE DRIVERS
Electrostatic Speakers Push-Pull Charge Migration Frequency Response Anomalies Flashover Orthodynamic Drivers Conductor Pattern Heil Air Motion Transformer Ribbon Tweeter Plasma Tweeter Piezo Tweeter
Section 3: BOXING CLEVER
Baffle/Doublet Doublet Adding Sides
Infinite Baffle Damping and Q Enclosure Size Sensitivity Dimensional Resonances Panel Resonance Reflected Wave Considerations Wall Speakers Reflex Enclosure Interaction at Resonances Disadvantages Auxiliary Bass Radiator Impedance Enclosure Design Summary The Horn Efficiency Flares Throat Design Domestic Hi-Fi Horns Transmission Line, Labyrinth Resonant Pipe Practical Problems
Section 4: ABSORBENTS
Panel Damping Air Resonances Materials Adiabatic Propagation Isothermal Propagation
Section 5: CROSSOVER NETWORKS
Capacitive Reactance Inductive Reactance First-Order Networks Higher Orders Band-Pass Filters
Components Ringing Cone Oscillation Damping Dispensing With The Crossover
Section 6: WHICH PARAMETERS MATTERS
Cost Size Frequency Response Phasing Ringing Power Rating and Sensitivity Impedance Distortion
Section 7: KAPELLMEISTER DESIGN BRIEF
Section 8: BUILDING THE KAPELLMEISTERS
First Stage Second Stage Third Stage Fourth Stage Fifth Stage Sixth Stage Seventh Stage Eighth Stage Ninth Stage Tenth Stage Eleventh Stage Twelfth Stage Performance Listening Tests How Much Bass Boost? Treble Boost
About the Author:
His work as an audio, television and radio engineer with several service organizations including that of Philips, gave him a wide experience expanded by his practical and advisory work on large public address systems. As a violinist who has played in several amateur orchestras, he is able to combine the viewpoints of both technician and musician.
His articles have appeared in the technical press for over thirty years, and he is the author of a dozen books on audio, acoustics and related subjects. He now works full time as a writer and audio consultant.
© 1988 BERNARD BABANI (publishing) LTD
First Published-November 1988
Revised and Reprinted--March 1991 Reprinted--June 1993 Reprinted- July 1994 Reprinted--April 1996 British Library Cataloguing in Publication Data. Capel, V.
An introduction to loudspeakers & enclosure design.
621.38'028'2 ISBN 0 85934 201 8
Cover Design by Gregor Arthur
Typeset direct from disk by Commercial Color Press, London E.7. Printed and bound in Great Britain by Cox & Wyman Ltd, Reading.
The Kapellmeister enclosure design was originally published in the July 1987 edition of Electronics Today International. The Author and Publishers of this guide would like to thank ETI for their kind permission in allowing the design to be included in this guide.
Although every care has been taken with the production of this guide to ensure that any projects, designs, modifications and/or programs, etc., contained herewith, operate in a correct and safe manner and also that any components specified are normally available in Great Britain, the Publishers do not accept responsibility in any way for the failure, including fault in design, of any project, design, modification or program to work correctly or to cause damage to any other equipment that it may be connected to or used in conjunction with, or in respect of any other damage or injury that may be so caused, nor do the Publishers accept responsibility in any way for the failure to obtain specified components.
Notice is also given that if equipment that is still under warranty is modified in any way or used or connected with home-built equipment then that warranty may be void.
Other Titles of Interest:
No. BP90 Audio Projects
No. BP111 Audio
No. BPI 22 Audio Amplifier Construction
No. BP277 High Power Audio Amplifier Construction
No. BP292 Public Address Loudspeaker Systems
No. BP297 Loudspeakers for Musicians
No. BP309 Preamplifier and Filter Circuits
No. BP310 Acoustic Feedback- How to Avoid It
AN INTRODUCTION TO LOUDSPEAKERS AND ENCLOSURE DESIGN by V CAPEL
BERNARD BABANI (publishing) LTD THE GRAMPIANS SHEPHERDS BUSH ROAD LONDON W6 7NF ENGLAND
Babani Electronics WS31 £3.99
An Introduction to Loudspeakers and Enclosure Design
There is more to building a loudspeaker enclosure than just fitting a couple of speaker units into a box.
There are many types of enclosure and drive units, each having their own features, good points and snags. Here we explore these, and in particular examine the whys and wherefores so that the reader can understand the principles involved and so make an informed choice of design, or even design loudspeaker enclosures for him or herself.
Crossover units are also explained, the various types, how they work, the distortions they produce and how to avoid them.
Finally, there is a step-by-step description of the construction of the Kapellmeister loudspeaker enclosure, a design that involves novel features which over come many of the disadvantages of more conventional types. It is a transmission line speaker that has remarkable stereo imaging, an uncolored musical sound, occupies minimal floor space, and is inexpensive to build.
BP 256 AZ.