By Topic

Design of velocity-feedback transducer systems for stable low-frequency behavior

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)
Holdaway, H. ; C.S.I.R.O. Wool Research Laboratories, New South Wales, Australia

Loudspeaker drive systems employing negative velocity feedback, by directly controlling the voice-coil motion, can improve the over-all linearity and largely suppress the fundamental resonance. These features permit good results using reasonably efficient loudspeakers in small sealed-box enclosures. In stable systems the degree of control provided is directly related to the loop gain. Instability and overloading problems can arise in partially capacity-coupled amplifiers unless special phase-compensation circuits are employed. For comparable distortion reduction at higher frequencies one must employ the same number of valves in the main amplifier as in conventional high-quality amplifiers. An additional valve stage is needed outside the main feedback loop to provide correction for the loss of 20 db per decade in radiating efficiency below the point of ultimate resistance of the equivalent piston radiator. The main amplifier is developed from Mullard circuits. Additions include a bridge in the voice-coil circuit and low-frequency phase-compensation elements. Reliable design procedures for these are given in detail. Specifications necessary for satisfactory performance are discussed.

Published in:

Audio, IEEE Transactions on  (Volume:AU-11 ,  Issue: 5 )