Electromagnetic Speaker:



The diagram below shows the make-up of a mechanical Electromagnetic Speaker.
A speaker that uses an Electromagnetic instead of a Permanent magnet.



Permanent Magnet Speaker:

The diagram below shows the make-up of a mechanical Permanent Magnet Speaker.
A Permanent Magnet is a magnet that will retain its magnetism indefinitely. A Permanent Magnet Speaker
is a speaker that uses a Permanent Magnet. The voice coil is the only part of the speaker that carriers electricity via two wires [signal currents].

Example of Common Types
Permanent Magnet Cone Speaker, Electrostatic Speaker, Magnaplanar Speaker.

Example or Common styles
Speaker Cone materials include; Paper Cone, Mylar Cone.
Small Speaker sizes, including frame; 50mm, 57mm, 66mm, 70mm, 77mm, 87mm, 92mm
Small Speaker Wattage; 0.25W to 12 watts

List of Speaker Manufacturers. Computer Speaker Manufacturers.
The first link is used for speaker components, as in just a speaker.
The second link is for a speaker unit, as in a speaker in a cabinet or enclosure.

Companion site; Technical Dictionary of Engineering Terms.