Ashly LIMITER/COMPRESSORS CL-100 - Manual (Page 15)

Voice-Over Compression ("Ducking")
The CL-SERIES can be used to automatically reduce music to a
background level when an announcer is speaking. In this scheme, only the
music signal is actually gain-reduced by the Ashly limiter. However, the
Detector is connected to respond to an announcer's voice instead of the
music’s peaks. The music output and the announoefs voice are then
combined in an external mix circuit. A variable gain control on the
announcer’s voice level is helpful in matching the aniM)uncer signal level to
the nominal 0 dBV threshold level of the detector.
The CL-50E as a ’Voice-Over" Compressor.
Stereo Operation
Two or more Ashly mono compressor/limiters may be tied together to
provide accurate stereo limiting and compression. This is simply a matter
of inserting a single patch cord between the STEREO TIE points of the
two units. The GAIN REDUCTION LED’s will still read independently,
with each indicator corresponding to half of the total gain reduction action.
The actual gain change is always identical for each limiter and is
determined by the louder channel. In this way, there is never any shifting of
the stereo perspective.
In permanent rack-mount installations, the Stereo "De points of two
CLrSOE’s or CLrlOO’s may be brought out to a convenient front panel switch
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(SPST) inserted into the “hot” line between the two patch points. This switch
will then select either stereo or independent tracking of the two units. □
SPECIAL NOTES ON THE CL-52E STEREO
COMPRESSOR/LIMITER
The CL-52E Compressor/Limiter is closely related to the model CL-50E
model. This section covers the minor differences and new features of the CL-52E.
Gain Reduction Meter Dispiay
The CLr52E features a threshold/gain reduction display which is very
similar to that used on the CL-50E, but with an expanded scale for greater
resolution. Each channel has its own display and they operate independently
except when the unit is in its “stereo tie" mode. The gain reduction display
will not be illuminated when:
1. The input signal is below the threshold and no limiting is taking place.
2. The limit in I out switch (near the output control) is in the “out” position.
Output Level Meter Display
A unique feature of the CL-52E is an output level meter for each channel.
These peak-responsive meters give a good indication of the actual output level
up to and including clipping (+20dBV). The output level meters are functional
at all times whether gain reduction is occurring or not.
Gain Reduction In/Out Switches
When either of these switches are in the OUT position, the corresponding
channel does not affect the level of the audio signal; it acts as a simple linear
amplifier. The GAIN and OUTPUT LEVEL controls still function, but no gain
reduction will occur. When either switch is pushed in (LED illuminated), gain
reduction will occur for any input signal exceeding the threshold.
Stereo Tie Switch
This switch replaces the STEREO TIE jacks on the CL-50E and links the
two channels for accurate stereo tracking when pushed in (LED illuminated).
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