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4.2 The Peak Limiter Section
How fast is the compressor to react to a signal which is above the threshold point? This is determined by the
attack time. A longer attack time is advisable to process low frequencies while shorter attack time is preferable
for high frequencies. IN this way you will avoid undesired dynamic distortion. But what about if you are mixing
a program with a wide range of frequencies? IN this case you should choose a setting that would benefit the
low frequency better. Well, life is not that easy for conventional compressor/limiters. Ok you handle an audio
signal made by a wide range of frequencies and you have chosen a longer attack time. But, if are using your
CLE 4.0 as a limiter the fast high frequencies will pass through untouched because the attack time is too slow
and such transients could cause distortion when the unit is connected to broadcast devices or taper recorders.
The solution in CLE 4.0 is represented by our Smart Gain Control (SGC) limiter circuit. The curve in bold is the
output signal and the dashed curve above it is the input signal. The area in between the two is the amount of
gain reduction.
The unit will activate the limiter when the signal exceeds the threshold for more than 20 microseconds. Then
1 second after that the signal is below threshold again, reduction goes back to 0dB and in this case input and
output signals are again identical.
5. INSTALLATION AND CONNECTION
5.1 Mains Connection
CLE 4.0 is provided with dual voltage plug. You must check the power supply Voltage available in your
Country before connecting the power cord in the wall outlet. Please see Page 7, furtherparagraph 12 for
info.
Chart. 5 SGC characteristic of the limiter section
5.2 Audio onnectionC
The CLE 4.0 Compressor/Limiter is equipped with balanced XLR connectors as well as 1/4" phone jack and
can be connected with other units in different ways to support a vast range of applications without experiencing
a signal loss.
a. Wiring Configuration
Both types of connectors available on CLE 4.0 can be wired in balanced and unbalanced modes. Please see following
drawing for details:
9
Peak Limiting
6ms 15ms
Level
Program Limiting
Input
Release
Output
approx. 1 s
Threshold
t/ms
30
20
10
Pic. 3
For 1/4" Phone jack
TS Type Unbalanced
Sleeve
Tip
+
TRS Type Balanced
Tip
Ring
Sleeve
+
-
TRS Type Unbalanced
Tip
Ring
Sleeve
+