Proel PC260 - Manual (Page 25)

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DYN - dynamic processor
To access the first page of the dynamic section, press the DYN button
and then the EDIT button of the channel you want to edit . Push the
DATA knob to select the parameter to edit and rotate the knob to
adjust it . Use PG UP and PG DW buttons for scrolling between the
two pages available .
Each input and output of the PC260 has a dynamic processor hat can be
configured as limiter or compressor and that provides a very complete set of
parameters to control the sound dynamics . The most typical setups includea
limiter on the outputs for protecting the speakers from excessive power and
a compressor on the inputs for enhance the performance of the loudspeaker
system or for controlling the sound pressure level .
THRE
This parameter set the threshold level for the compressor/limiter . Below the
threshold no compression/limiting occurs, above the threshold the signal is
compress or limited as indicated in the dynamic curve . The threshold level is referred to the 0 dB: if the input has no attenuation it
corresponds to 0 dBu (775 mV) of the input signal, so Threshold = +21 dB (max signal) means no detection of input signal .
See further the SPEAKER PROTECTION SETTING information note for more details .
ATK
Attack time: determines how quickly the compressor/limiter reacts when the
signal reaches above the threshold .
REL
Release time: determines how slowly the compressor/limiter restores its normal
gain after the signal goes below the threshold .
Attack and release times are dependent to the music genre and to the type of
loudspeaker connected to the outputs . For an compressor/limiter on the inputs
we suggest to start using a medium-long time for both attack and release
time, such as 50mS for the attack and 450mS for the release, then shortest or
longer the times if some audible artefacts are noted . For an output limiter for a
specified speaker type we suggest to start with the times indicated in the table
below and then adjust them if some audible artefacts are noted .
MODE
This parameter is used to set the dynamic processor as compressor (Comp)
or limiter (Lim) . When it is set as limiter the RATIO parameter is not available
because the limiter has a fixed ratio of
∞
: 1 . In limiter mode also the KNEE
parameter, fixed as hard knee, and the GAIN parameter are not available .
RATIO
Available only when the dynamic processor is set
as compressor, this parameter sets the amount of
compression for the signal . In other words, it determines
the input/output ratio for signals above the threshold .
For example, a 5:1 ratio means that an input signal
overshooting the threshold by 5 dB will goes out
compressed to 1 dB .
KNEE
This parameter controls the transition from
uncompressed to compressed signal in the dynamic
curve of the dynamic processor .
Knee works in conjuction with the Ratio parameter to “gently” reduce the dynamic of the signal minimizing the effects of non-naturality
that a hard compression causes, especially for higher ratios where the changeover from uncompressed and compressed signal is
more noticeable . The knee can be set as follow:
Hard: select a basic hard transition of the dynamic curve .
Soft1: select a smooth and continuous transition of the dynamic curve from 5dB under the threshold to 5dB above the threshold .
Soft2: select a smooth and continuous transition of the dynamic curve from 10dB under the threshold to 10dB above the threshold .
REDU METER
This is a meter showing when and how much the compressor/limiter is reducing the audio signal . It works only when the dynamic
processor is enabled (BYPASS is “OFF”) .
GAIN
Gain control lets you to compensate the overall level reduction of a compressed signal . This parameter is not available when the
dynamic processor is set as limiter .
BYPASS
This parameter enables or disables the dynamic processor .
OUT GRAPH
This graph shows the dynamic curve, i .e . the relation between the input level and output level .
Minimum frequency (HPF) Attack time (max) Release time (min)
15 .6 Hz - 62 .5 Hz
45 mS 450 mS
62 .5 Hz - 125 Hz 20 mS 250 mS
125 Hz - 250 Hz 8 mS 130 mS
250 Hz - 500 Hz 4 mS 80 mS
500 Hz - 2K Hz 2 mS 30 mS
2K Hz - 20K Hz 1 mS 10 mS