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We have compiled a list of audio, video and home theater terms that you
might find helpful as you research your next purchase.
From A-Z, this glossary should have all the answers.
Glossary of Terms:
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E
F
G
H
I
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M
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F
F3
The roll-off frequency at which the driver's response is down -3dB from the level of it's midband response.
Farad
The basic unit of capacitance. A capacitor has a value of one farad when it can store one coulomb of charge with one volt across it.
Fb
The tuned frequency of a ported box.
Fc or Fcb
The system resonance frequency of a driver in a sealed box. The system resonance frequency of a driver in a sealed box.
Feedback
The transmission of current or voltage from the output of a device back to the input, where it interacts with the input signal to modify operation of the device. Feedback is positive when it's in phase with the input and negative when it's out of phase.
Fibrecrete
A mixture of concrete and fibres, unique to B&W for loudspeaker manufacture. This material was used, for example, to line the inside of the midrange enclosure that sits on top of the bass cabinet of the Matrix 801 and 802. Fibrecrete stiffens and deadens the structure, resulting in minimal mechanical resonance.
Filter
An electrical circuit or mechanical device that removes or attenuates energy at certain frequencies. An electrical circuit or mechanical device that removes or attenuates energy at certain frequencies.
FireWire
FireWire is the popular name for a high-speed digital standard for connecting peripherals such as digital video cameras, audio components and computer devices. FireWire was originally developed by Apple Computer as a replacement for the SCSI bus. IEEE 1394 is formal name for the standard. Vendors must obtain a license from Apple to use the term FireWire. (See also
IEEE 1394 )
Flat Response
The faithful reproduction of an audio signal. Specifically, the variations in output level of less than 1 dB above or below a median level over the audio spectrum.
Fletcher-Munson Curve
Our sensitivity to sound depends on its frequency and volume. Human ears are most sensitive to sounds in the midrange. At lower volume levels humans are less sensitive to sounds away from the midrange, bass and treble sounds seem reduced in intensity at lower listening levels.
Flowport
A dimpled and flared port tube that reduces the turbulence of the air flow in the pipe, virtually eliminating chuffing noises.
Free Air Response
The natural resonant frequency of a driver when operating outside an enclosure.
Frequency
The measurement of the number of cycles per second in an audio tone or an alternating current. Humans perceive frequency subjectively as pitch (eg: 440Hz = A). The range of human hearing is typically considered to range from 20Hz to 20,000Hz - (20Hz - 20kHz). The number of cycles (vibrations) per second. In video, frequency is used to define the image resolution. Low-frequency video images depict large objects or images. Higher frequencies depict smaller objects (finer details).
(See also Hertz-Hz) (See also Cycles Per Second)
Fs
The frequency of resonance for a driver in free air.
Full-Range
A speaker designed to reproduce all or most of the sound spectrum.
Fundamental
The lowest frequency of a note in a complex wave form or chord.
Fuse
A safety device consisting of a low melting-point wire with a low melting point which breaks an electrical circuit by heating up and melting (fusing) if the current through it is too high. |
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