Reflex_loudspeaker_animation_2.gif
Summary
Description Reflex loudspeaker animation 2.gif |
English:
Animation showing the operation of a reflex loudspeaker. Drawing shows a cross section through the speaker, the construction is cylindrically symmetrical. The reflex or reentrant loudspeaker, also called a megaphone, bullhorn, or loudhailer, is a type of
folded horn speaker
widely used in
public address systems
. It consists of a specialized diaphragm loudspeaker called a
compression driver
(a)
attached to a metal or plastic horn
(d)
. The driver has a small metal diaphragm
(blue)
driven to vibrate by the audio signal current flowing through a coil of wire
(red)
between the poles of a cylindrical magnet
(green)
. The horn serves to couple the diaphragm more efficiently to the air, allowing it to radiate more of its energy as sound than a conventional horn speaker, making it louder. The horn sound path must be several feet long, so to make the speaker more compact the sound path is "folded" into a zigzag shape by several concentric exponentially-widening ducts. The sound waves pass forward through an inner tube
(b)
in the central projection in the horn, back through a larger concentric tube
(c)
, then out through the surrounding horn
(d)
.
Reentrant loudspeakers can be 10 times as efficient as cone loudspeakers, and so their output can be 10 dB louder when operating from the same amplifier. However their frequency response is very uneven and limited, with a bandwidth of 300-400 Hz to 5 kHz, so they have a distinctive "tinny" sound and are only used for the human voice.
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Date | |
Source | Own work |
Author | Chetvorno |
Other versions |
This is an improved version of my previous animation Reflex loudspeaker animation.gif . Improvements:
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Licensing
I, the copyright holder of this work, hereby publish it under the following license:
This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication . | |
The person who associated a work with this deed has dedicated the work to the
public domain
by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
http://creativecommons.org/publicdomain/zero/1.0/deed.en CC0 Creative Commons Zero, Public Domain Dedication false false |