bipolar magnetic driving unit

bipolar magnetic driving unit

[bī′pō·lər mag′ned·ik ′driv·iŋ ‚yü·nət]
(engineering acoustics)
Headphone or loudspeaker unit having two magnetic poles acting directly on a flexible iron diaphragm.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.