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Entries found for search: loudspeaker

electrostatic loudspeaker : A dipole speaker with a transducer that uses the audio signal to vary the strength of an electric field which, in turn, induces vibration in a metallic or metalized membrane. In principle, it is the reverse of an electrostatic microphone, and very different from the more common electromagneticelectro-magnetic voice coil arrangement. Used for consumer equipment as the power output is low. Electrostatic speakers are usually quite large, such as 6 high by 2 or 3 wide. They are always direct radiators, and they must be large to attain reasonable efficiency at low frequencies. The radiation pattern of an electrostatic speaker in a free-field is similar to that of a figure-eight microphone. Because of their large size, electrostatic loudspeakers tend to become very directional in the high-frequency range. They are also characterized by a low impedance, and this is problematic for some amplifiers. See also planar loudspeaker.

loudspeaker : A transducer which converts electrical energy into acoustical energy. The most common type of loudspeaker today is the dynamic loudspeaker which has a resonant frequency, the frequency at which it will vibrate naturally if perturbed. The resonant frequency, also called the natural frequency, will be near the lowest frequency that the speaker will reproduce well, and is that frequency at which it is easiest to move the cone (the output from the speaker will be at a maximum). Damping must be added to a speaker system in order to reduce this peak in response.

planar loudspeaker : A type of dipole loudspeaker design which combines aspects of both dynamic and electrostatic designs. The planar speaker consists of a large plastic sheet with conducting wires embedded in it, these wires functioning as the voice coil. Many small magnets in front and behind the sheet set up a magnetic field so current in the wires causes a force on it and it moves as a unit, similar to an electrostatic speaker. Planar speakers suffer from the same directional problems as electrostatic loudspeakers, but their impedance is more similar to dynamic designs.

dynamic loudspeaker : See loudspeaker.



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