E-F

E

EBP
Efficiency Bandwidth Product.
A guide that helps a designer determine whether a driver is more suitable for a sealed or ported enclosure.
EBP of less than 50 indicates the driver should be used in a sealed enclosure. 50 - 90 indicates flexible design options... over 90 indicates best for a ported enclosure.
EBP = Fs / Qes

Editors
Processing windows in which MIDI and audio tracks are processed or edited in detail.

Effects
Devices or plug-ins that refine or reshape audio signals. Reverb, delay and chorus are typical effects that see widespread use.

Efficiency rating
The loudspeaker parameter that gives the level of sound output when measured at a prescribed distance with a standard level of electrical energy fed into the speaker.

Electronic Crossover
Uses active circuitry to send signals to appropriate drivers. More efficient than passive crossovers. Uses active circuitry to send signals to appropriate drivers. More efficient than passive crossovers.

Electrostatic Speaker
A speaker that radiates sound from a large diaphragm that is suspended between high-voltage grids.

Enhanced IDE (Integrated Device Electronics)
This standard serves to connect hard disks and other mass storage media to a computer.

Equalizer
Electronic set of filters used to boost or attenuate certain frequencies.

Extension
How extended a range of frequencies the device can reproduce accurately. Bass extension refers to how low a frequency tone will the system reproduce, high-frequency extension refers to how high in frequency will the system play.


F

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.

Filter
An electrical circuit or mechanical device that removes or attenuates energy at certain frequencies.

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.

F3
The roll-off frequency at which the driver's response is down -3dB from the level of it's midband response.

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.

Free Air Resonance
The natural resonant frequency of a driver when operating outside an enclosure.

Frequency
The range of human hearing is commonly given as 20-20,000Hz (20Hz-20kHz). One hertz (Hz) represents one cycle per second, 20Hz represents 20 cycles per second and so on. Lower numbers are lower frequencies

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.