EAW DX810 Instruction Manual download pdf (Page 24)

24 – DX8

Compress

•

Ratio:

This determines the change in output level as a

function of the change in input level, once the

threshold has been exceeded. It is calibrated in

decibels, with a range from 1:1 (off) to 20:1. Thus, if it

is set to 10:1, an increase in input level of 10 dB

(assuming the input is above the threshold level),

results in a 1 dB increase in output level.

As a general rule, use ratio settings from 1:1.5 to 1:5

for compressor use. Settings from 1:10 to 1:20 are

more useful for limiting purposes, because in that

range the output level changes very little as the input

increases.

•

Output:

This determines the overall gain of the

compressor from input to output (as measured with

the signal below the threshold level). You can use this

control to compensate for the loss of gain caused by

the action of the compressor. It is calibrated in

decibels, with a range from unity (0 dB) to +20.0 dB.

Automix

Click this button to open the Compressor window

for the A and B outputs. Each compressor has five

knobs: Attack, Release, Threshold, Ratio, and Output.

Click and drag on the individual knobs to adjust each

parameter. An analog-style meter indicates the

amount of compression applied in decibels.

Click the

button to turn each Compressor on

and off. The Compressor can also be turned on and

off with the buttons on the output strip. Click the

RESET

button to return all the knobs to their default

settings.

The

A to B

button (and corresponding

B to A

button on the B side) copy the settings of the A

Compressor to the B Compressor (and vice versa).

About Compression:

A compressor is used to reduce or limit transient

peaks in a signal. As the input level to the

compressor increases, the output level increases

linearly until the threshold point is reached. After

that point, the output level no longer increases

linearly, but increases at a reduced rate that is

determined by the ratio setting.

•

Threshold

: This control determines the level at which

the compressor begins to act on the incoming signal.

It is calibrated in decibels, with a range from –60.0 dB

to –1.0 dB.

•

Attack

: This determines how fast the compressor

reacts once the threshold has been exceeded. It is

calibrated in milliseconds, with a range from 1 ms to

2500 ms (2.5 seconds).

•

Release:

This determines how fast the compressor

turns off once the signal falls below the threshold. It is

calibrated in milliseconds, with a range from 10 ms to

2500 ms (2.5 seconds).

One of the dangers of using a conventional mixer in

a sound system operated by an untrained sound

technician is the occurrence of feedback. The more

open channels there are, the greater the overall

system gain and the lower the potential acoustic

gain (gain before feedback).

A trained operator knows that when a single

microphone is on, the gain of the single channel can

be turned up to a point just before feedback starts

to occur, and then backed off a little to provide a

safety margin (feedback stability margin). But if a

second microphone is turned on, the first

microphone’s gain must be reduced to compensate

for the additional gain provided by the second

microphone. If the first microphone isn’t turned

down, feedback could occur.

The Automix feature automatically adjusts the

input gains, depending on how many open channels

there are at any given time. This number of open

microphones (NOM) is used to calculate the gain

adjustment (attenuation) for each channel.

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EAW DX810 Instruction Manual Page 24

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