6
DRAWMER
T
HREE
-
SUM
O
PERATOR’S
M
ANUAL
CONTROL DESCRIPTION
Input Level Trim:
-10dB - +10dB
Typically, the Input Trim level control is used to match the output of the preceding
device to the input needs of the three compressors that the signal will pass
through. Alter the “Meter Input/Output Switch” to "input" to see the effect of the
input trim on the signal level to the three compressors.
On an optimal signal the 0dB provides optimum headroom and signal-to-noise
ratio. If the input trim is set too low little compression will occur (and, raising the
overall output level of the signal will amplify the noise floor). Alternatively, increasing
the input trim control pushes more level into the compressors and therefore more
compression occurs.
Low Split Frequency:
18Hz - 1.6kHz
Sets the frequency point at which the split between low and mid bands occurs.
High Split Frequency:
530Hz - 42kHz
Sets the frequency point at which the split between mid and high bands occurs.
THREE BAND
Switches:
Low: is the signal below that set by the Low Split Frequency;
Mid: is the signal between that set by the two Split Frequency controls;
High: is the signal above that set by the High Split Frequency control.
Across all three bands
Mute:
In the “MUTE” position the signal for that particular band is effectively turned off.
Any combination of mute is available - to hear only the signal of the low band
mute the mid and high bands etc.
Bypass:
In the “BYPASS” position the signal for the low, mid, or high band is allowed to
pass through to the summing stage without being output to a compressor.
Using a combination of mute and bypass switches for the various bands allows
the operator to hear and monitor only the frequencies that are required and so
tune the low and high frequency settings.
Output Gain:
-10dB - +10dB
After the three bands have returned to the Three-Sum the signal is summed back
to a single stereo band. If at this point the signal is too low or so high that
eccessive limiting occurs then it would be difficult to adjusts all three gain controls
of each compressor whilst maintaining the low/mid/high balance, for this reason
a single OUTPUT GAIN control has been incorporated.
Adjust so that the limiter works only on signal peaks.
CHAPTER 2
