Cloud CX335 Manual de instalación y funcionamiento - Página 11
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Page 10
the level and frequency of the incoming signal. For this reason the Attack and Release
controls have been removed from the front panel.
5f
Gain requirements
When the signal exceeds threshold and the compressor takes effect, there will be a
reduction in the real output 'volume'. This volume reduction is made back up to the original
level with the Gain control. In normal use, the average amount of level reduction shown on
the gain reduction meter, will be the position to where the Gain control is rotated positively. A
point to note is that this gain is applied to all signals, whether above or below any thresholds,
so quiet sounds will be louder by the amount of gain make-up, even the residual background
system noise!
5g
Understanding Compressor Limiters verses Peak limiting
Due to the range of the ratio control, the compressor can be set up to perform as a very
effective limiter. Further more, with its soft knee operation, the characteristics of the unit
blend from gentle compression for signal just above threshold, through to hard limiting. The
intelligent control circuitry and programme dependent attack and release make the audible
effect almost un-noticeable. This compressor limiter section should not be confused with the
Peak limiter in the CX335. This is intended to be used as a system failsafe for any high
peaks that are still quite high even after some compression has occurred.
For example, with signals above the compressor threshold, if the ratio is set to 3:1 and the
input rises by +15dB there will still be a +5dB rise at the output. This rise might cause a
system overload, except this can be trapped by the Limiter section providing the Peak Limit
threshold is correctly adjusted. The optimum use of the Peak Limiter is when used in this
method. It is difficult to give a generalisation for limiter threshold settings as many factors
govern this value:
Firstly, how much level can be sent from the mixing console? In a well configured system this
will average around 0dB, but with only slightly too much gain at each mixing stage this level
can soon rise far higher. The Peak limiter can be set to capture this overload.
Secondly, how much signal is required by the amplifier or crossover inputs? If the Peak
Limiter is set too high then any peaks allowed through the CX335 might cause input
distortion or overload to the following amplifier. It is more likely that the amplifiers will clip
before the output signal clips
5h
Other nomenclature.
Side-Chain - The control circuit that decides how much gain reduction to apply at any one
instant, depending on the input level and the front panel controls is called the side-chain. In a
standard compressor the circuitry only has two main sections: the audio path and the side
chain.
Gain Reduction - The difference between the measured output level after the compressor
has taken effect and the level that would be output if no processing were happening.
6
Control Descriptions
6a
Envelope switch
In the slow position it modifies the programme-dependant circuitry to allow fast dynamic
peaks through unprocessed, yet still monitor and control level when the input is above the
15-07-02 V3
CX335: Installation and Operation Manual