Any speaker that encloses the backwave of the speaker device even though part of this backwave may be released via a port or duct The primary radiation at most frequencies will be from the driver front If the driver is not enclosed it becomes a dipole
(a)A single north or south magnetic pole (not found in nature) (b)Tower A structure used to place antennas, fabricated as a single pole, (not previously found in nature )
A hypothetical particle that has only one pole of magnetic charge instead of the usual two. A magnetic monopole would be a basic unit of magnetic charge