Clearly then, sensitivity does not correlate precisely with efficiency, as it also depends on the directivity of the driver being tested and the acoustic environment in front of the actual loudspeaker. A few have backings that limit the dipole radiation pattern. The remainder is converted to heat, mostly in the voice coil and magnet assembly. The standard flat panel speaker has a exciter attached to a square panel. The long permanent magnets create separate ‘cells’ and the whole diaphragm ends up moving uniformly.

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May Learn how and when to remove this template message. Only the wire to the amplifier is eliminated.

Electrodynamic Loudspeaker | Article about Electrodynamic Loudspeaker by The Free Dictionary

Loudspeakeer can hear audio from 20 – 20, Hertz. In the circuit of Fig. For other uses, see Loudspeaker disambiguation. The simplest possible radiating source is a point source, sometimes called a simple source. The rigidity of the material increases from the center to the outside. Because they are driven over the entire membrane surface rather than from a small voice coil, they ordinarily provide a more linear and lower-distortion motion than dynamic drivers.

This history article is a stub. These first loudspeakers used electromagnetsbecause large, powerful permanent magnets were generally not available at a reasonable price. In these applications, sound quality is a low priority.

Archived from electrodynamlc original PDF on The main cone in a whizzer design is manufactured so as to flex more in the outer diameter than in the center. It was replaced by the record. Any technique that uses crossover filtering followed by amplification is commonly known as bi-amping, tri-amping, quad-amping, and so on, depending on the minimum number of amplifier channels.


Field coil loudspeaker

Rather than move back-and-forth as conventional speakers do, the cone rippled and created sound in a manner known in RF electronics as loudspeeaker “transmission line”.

A major problem in tweeter design is achieving wide angular sound coverage off-axis responsesince high frequency sound tends to leave the speaker in narrow beams. Photos copyright Edison Tech Center, permission required for use.

Why did it take so long to invent the speaker? Frequency is responsible for the quality of sound in a speaker, decibels measure the ‘loudness’ of the electrodynammic.

History and Types of Loudspeakers

Loudspeakers American inventions Audiovisual introductions in Audio engineering Music technology Consumer electronics. There are several kinds of eletrodynamic panel speakers, engineers have been working on flat speakers for many decades as to decrease the size of speaker boxes.

The range of voice coil volume within which improved efficiency will result by the use of aluminum instead of copper for the condition of Fig. Most sounds fall in the lower range of our audible frequency range, however sounds at 16, or 20, Hz are important. A subwoofer is a loidspeaker driver used only for the lowest-pitched part of the audio spectrum: Schottky invented the first ribbon loudspeaker together with Dr.


The three most commonly used sound radiation systems are the cone, dome and horn type drivers.

Clapping one’s hands in a typical empty room, without draperies or carpet, produces a zippy, fluttery echo due both to a lack of absorption and to reverberation that is, repeated echoes from flat reflective walls, floor, and ceiling.

For all of the data plotted in Fig.

RCA was created under pressure from the US government to have major electric technology companies work together with their various patents in order to more easily create finished products which could compete with state-sponsored European companies. Audio recording for entertainment and record keeping, later on for voice radio. This electronics-related article is a stub. Individual electrodynamic drivers provide their best performance within a limited frequency range.

Back in the early part of the 20th century the basic knowledge of math and frequencies was still being explored. This can be reduced by internal absorption using absorptive materials often called “damping”such as glass woolwool, or synthetic fiber batting, within the enclosure.