Crest Audio IPRO ONE 매뉴얼 - 페이지 12

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DYNAMICS CONTROL SETTING PROCEDURES

(EXPANDER, COMPRESSOR, LIMITER)

If you are starting from scratch, or have gotten something out of whack and do not know exactly what to adjust, begin by

setting the controls so that all functions are disabled.

Here are the control positions for this:

EX THRESH:

EX RATIO:

COMP THRESH:

COMP RATIO:

LIMIT:

CMP GAIN:

Naturally, the controls that need to be adjusted will depend on what you want accomplished. Here are some suggestions

to get you up and running - just follow the order listed, and leave the controls in the above (disabled) positions if that

particular function is not required.

Determine the maximum output level and adjust the LIMIT THRESHOLD so that at the loudest peaks the output

level never exceeds this point. (The action of the limiter can be seen on the GAIN REDUCTION METER and at

its own LED threshold indicator. If these never activate, there is no limit activity.) One way to accomplish this is

to deliberately increase the mic input gain (or line level control) past the desired maximum level, then turn the

LIMIT THRESHOLD control CCW until it limits it to the correct level, then reset the input(s) to normal operating

levels.

To set up a noise gate, first turn the EXPANDER RATIO control fully CW (1:5). During quiet passages of the

source (between songs, when the mics are not being used, etc.) adjust the EXPANDER THRESHOLD CW until

gain reduction is indicated (a reduction of –12 dB is a good starting point). Re-adjust the EXPANDER RATIO to

set the desired gating action when the source changes from noise to signal. Low threshold settings have little

action and can tolerate a higher threshold without coloring the sound. The maximum of 1:5 will cause an abrupt

turn on and off when the signal changes and will probably need a lower threshold setting to prevent the signal

from dropping off when you don't want it to. You may have to go back and adjust the threshold after the ratio has

been changed, since the soft knee circuitry has more effect at lower ratios, making the transition point less

obvious.

For typical vocal compression, set the COMPRESSOR RATIO control to 3:1 (a range of 2:1 to 6:1 is common)

and adjust the COMPRESSOR THRESHOLD until the desired amount of gain reduction is seen on the meter.

This is a personal preference, but continuous gain reduction greater than -9 dB (especially with higher ratios)

could be excessive and could create an unnatural sound. Lower ratios have a more gentle effect.

After all other settings are made, adjust the COMPRESSOR GAIN control for a 0 dB average on the output

meter to recover any level losses due to compression.

min (off)

min (1:1)

max (+20 dB)

min (1:1)

max (+22)

min (0 dB)