A device which converts electrical signals into sounds loud enough to be heard at a distance, usually outdoors; it is used to amplify or transmit over a distance speech from a person, who is typically speaking into a microphone. Sometimes it is used to play recorded speech or music.

The part of a sound system which produces the sound and "throws" it out to the audience. There are a number of kinds of speaker (as they are usually called): tweeters (qv), horns (qv), bass cabs (qv).

A transducer (or group of transducers) within a single cabinet that converts electrical energy into acoustical energy. The piece of equipment that makes the sound. see driver

Audio: A speaker system which includes the enclosure, the driver or complement of drivers, and the associated electronics, such as a crossover network or internal amplifier.

a reactive load, meaning impedance changes with frequency

a very complex design, with several aspects (and compromises) that concour to the final result

a very complex impedance, having resistive, inductive and capacitance components in addition to motional impedance