Mackie CR1604 Owner's Manual download pdf (Page 36)

echo

The reflection of sound from a surface such

as a wall or a floor. Reverberation and echo are

terms that can be used interchangeably, but in

audio parlance a distinction is usually made:

echo is considered to be a distinct, recogniz-

able repetition (or series of repetitions) of a

word, note, phrase or sound, whereas rever-

beration is a diffuse, continuously smooth

decay of sound. Echo and reverberation can be

added in sound mixing by sending the original

sound to an electronic (or electronic/acoustic)

system that mimics natural echoes, and then

some. The added echo is returned to the blend

through additional mixer inputs. Highly echoic

rooms are called live; rooms with very little

echo are called dead. A sound source without

added echo is dry; one with reverb or echo

added is wet.

effects devices

External signal processors used to add re-

verb, delay, spatial or psychoacoustic effects to

an audio signal. An effects processor may be

used as an insert processor (serial) on a par-

ticular input or su/jointfilesconvert/319773/bgroup, or it may be used via

the aux send/return system(parallel). See also

echo, reverb.

EIN

Equivalent Input Noise. Specification that

helps measure the “quietness” of a gain stage by

deriving the equivalent input noise voltage nec-

essary to obtain a given preamp's output noise.

Typically ranges from –125 to –129.5 dBm.

See equalization.

EQ curve

A graph of the response of an equalizer,

with frequency on the x (horizontal) axis and

amplitude (level) on the y (vertical) axis.

Equalizer types and effects are often named

after the shape of the graphed response curve,

such as peak, dip, shelf, notch, knee and so on.

equalization

Equalization (EQ) refers to purposefully

changing the frequency response of a circuit,

sometimes to correct for previous unequal re-

sponse (hence the term, equalization), and

more often to add or subtract level at certain

frequencies for sound enhancement, to remove

extraneous sounds, or to create completely

new and different sounds.

Bass and treble controls on your stereo are

EQ; so are the units called parametrics and

graphics and notch filters.

A lot of how we refer to equalization has to

do with what a graph of the frequency re-

sponse would look like. A flat response (no

EQ) is a straight line; a peak looks like a hill, a

dip is a valley, a notch is a really skinny valley,

and a shelf looks like a plateau (or a shelf).

The slope is the grade of the hill on the graph.

Graphic equalizers have enough frequency

slider controls to form a graph of the EQ right

on the front panel. Parametric EQs let you vary

several EQ parameters at once. A filter is sim-

ply a form of equalizer that allows certain

frequencies through unmolested while reduc-

ing or eliminating other frequencies.

Aside from the level controls, EQs are prob-

ably the second most powerful controls on any

mixer (no, the power switch doesn’t count!).

fader

Another name for an audio level control.

Today, the term refers to a straight-line slide

control rather than a rotary control.

family of curves

A composite graph showing on one chart

several examples of possible EQ curves for a

given equalizer or equalizer section.

filter

A simple equalizer designed to remove cer-

tain ranges of frequencies. A low-cut filter

(also called a high-pass filter) reduces or

eliminates frequencies below its cutoff fre-

quency. There are also high-cut (low-pass)

filters, bandpass filters, which cut both high

and low frequencies but leave a band of fre-

quencies in the middle untouched, and notch

filters, which remove a narrow band but leave

the high and low frequencies alone.

flanging

A term for phasing. Before digital delay ef-

fects units, phasing could be accomplished by

playing two tape machines in synchronization,

then delaying one slightly by rubbing a finger

on the reel flange. Get it?

FOH

An acronym for Front Of House. See house

and main house speakers.

frequency

The number of times an event repeats itself

in a given period. Sound waves and the electri-

cal signals that represent sound waves in an

audio circuit have repetitive patterns that range

from a frequency of about 20 repetitions per

second to about 20,000 repetitions per second.

Sound is the vibration or combination of vibra-

tions in this range of 20 to 20,000 repetitions per

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Mackie CR1604 Owner's Manual Page 36

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