Enabling The Limiters; Adjusting The Threshold; Linking Limiters - Sound Devices 688 User Manual

688 User's Guide

Enabling the Limiters

When enabled, the limiters are globally activated at either a Hard Knee or Soft
Knee setting. The knee of the limiter determines how the limiter operates in
relation to the set threshold. With hard knee, when the signal reaches the
threshold, the mixer immediately attenuates only those peaks above the
threshold, compressing at whatever ratio is set. With soft knee, attenuation
begins slightly before the threshold—at about 6 dB—for a more gradual, tape-
like sound, making the compression much more difficult to detect.
To enable or disable limiters:
1. Press the MENU button.
2. Turn and press the Headphone encoder to select LIMITERS > Limiter
Enable.
3. Turn and press the Headphone encoder to activate or deactivate the limiter.
Options include: Off, Hard Knee, and Soft Knee.

Adjusting the Threshold

The default threshold of all limiters is 16 dBu; however, that may be adjusted
from 4 dBu to 18 dBu in 1 dBu increments.
To adjust the threshold:
1. Press the MENU button.
2. Turn and press the Headphone encoder to select LIMITERS.
3. Define the threshold parameters based on the following table:
p
arameter
Input 1-6 Post-
Fade Threshold
L, R Threshold
X1, X2 Threshold Sets the limiter threshold for the Aux Bus.

Linking Limiters

Limiters for L, R and X1, X2 channel pairs can be linked on the 688. Anytime
two limiters are linked, both channels will be limited when signal reaches the
threshold in any channel of the pair.
Linking inputs as a stereo pair also links those inputs' limiters.
i
46
D
escription
Sets the level at which input limiters will begin
attenuating on inputs 1-6.
Sets the limiter threshold for the Master Bus.
o
ptions
• +4 dBu - +18 dBu
(1 dBu increments)
• +4 dBu - +18 dBu
(1 dBu increments)
• +4 dBu - +18 dBu
(1 dBu increments)