Nilfisk-ALTO CLE2.0 - Manual (Page 13)

4.3 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 2.0 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 2.0 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 15 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 2.0 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 Page9, paragraph 22 for further info.
5.2 Audio connection
The CLE 2.0 Compressor/Limiter/Gate 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.
Chart. 7 SGC characteristic of the limiter section
12
4.2.8 Gain Reduction eter M
This consists of 12 LED on the front of the CLE 2.0. Through this Led meter you can visualise the amount of
gain reduction at any given time.
Chart. 6 The effect of a compressor can be expressed as the amount
of gain reduction that is taking place for any given input
Peak Limiting
6ms 15ms
Level
Program Limiting
Input
Release
Output
approx. 1 s
Threshold
t/ms
30 20 10