ROLLS CL151 GLC Compressor/Limiter/ Gate User Guide
- June 6, 2024
- Rolls
Table of Contents
ROLLS CL151 GLC Compressor/Limiter/ Gate User Guide
INTRODUCTION
Thank you for your purchase of the CL151 GLC Gate Compressor Limiter. This
unit provides smooth, soft-knee compression and limiting with a gate. Gain
reduction is indicated via a front panel 5-segment LED bar graph. Plus, the
unit has a mic preamp input with phantom power available.
WARRANTY INFO Please visit our website, www.rolls.com, for the Rolls 1 Year
Warranty information and registration.
INPUT: Adjusts the amount of input signal to the CL151, from no signal to +20
dB.
GATE REL: This control adjusts the amount of time taken for the gate circuitry
to “close” or mute the output, after the signal level has dropped below the
gate Threshold level.
THRESH: Sets the point at which the input signal must surpass to “open” the
gate circuitry or allow signal to pass to the output. GATE LED: When lit,
indicates that the gate is “closed” or the output is muted.
COMP RATIO: This control sets the signal to compression ratio. This ratio
relates to the amount of increase of input compared to output signal. Thus, at
a 1:1 ratio, a 1 dB increase of input signal will result in a 1 dB increase of
output signal. At 2:1, a 2 dB increase of input signal will result in only 1
dB increase of output signal. At 8:1, an 8 dB increase of input signal will
result in a 1dB increase of output signal. THRESH: Sets the point that the
input signal must reach for compression to begin.
GAIN REDUCTION LED’s: This LED ladder indicates the amount of signal
compression, or gain reduction. OUTPUT: Adjusts the amount of overall output
signal from the CL151. PWR: Indicates that the CL151 is connected to the power
source, and the unit is on.
REAR PANEL MIC IN: Balanced XLR jack, for connection to any standard dynamic
or condenser microphone.
LINE IN: Balanced 1/4″ TRS jack for connection to balanced or unbalanced line
level signals. SIDE CHAIN: 1/4″ TRS jack for connection via TRS insert cable
to a device such as an equalizer or other device, for direct access to the
CL151 detector circuitry. LINE OUT: Balanced 1/4″ TRS jack for connection to a
mixer’s line input or to an amplifier. DC IN: For connection to the Rolls
PS27s 15 VDC, power supply; outside of the barrel is positive.
SIDE PANEL PHANTOM POWER: Switch for connecting phantom power to the XLR Mic
Input.
CONNECTION AND OPERATION
The example below shows the connection of a microphone. If the microphone
requires phantom power, make sure the Phantom Power is on. Connect the output
of the CL151 via a balanced or unbalanced 1/4″ plug to the input of a mixer or
amplifier.
Begin adjustments by setting the INPUT and OUTPUT levels at O (about 10
O’clock). This setting is for “unity gain”.
Set the gate THRESH for “off”, the COMP RATIO for 1:1, and the compressor
THRESH for +10. These initial settings essentially bypass the gate and
compressor circuits.
The compressor RATIO and THRESH controls work together to control the amount
of compression, and the point at which compression begins respectively.
Decreasing the THRESH control lowers the amount of signal required to begin
compression – so it compresses sooner. This works with the RATIO control
which, when increased, increases the amount of compression.
The gate THRESH control, after being turned slightly counterclockwise from the
“off” position, goes to its maximum level. This means it requires a higher
signal level to “open” the gate. As the gate THRESH control is turned
counterclockwise, a lower and lower signal is required to open the gate.
The gate REL (release time) control sets the amount of time taken for the gate
to “close” after the signal drops below the THRESH level. For example, the
CL151 will continue passing a sustaining note until the level drops below the
THRESH level, and the REL time has passed.
The plug connected to the Tip is the “Send” which will connect to the Input of
the signal processing device, and the Ring is the “Return” which connects
directly to the detector (compression control) circuit.
Side Chain circuits are often used in “ducking”. Ducking is momentarily
lowering one signal under another signal. For example, you may wish to
automatically lower a music signal under a paging microphone signal, then have
the music return to normal level after the page is over. This would be
accomplished by running the music into the compressor, and having the page
signal connect into the Side Chain return. The page signal must also be
connected to the main mixer or amplifier as well. When the paging signal
begins, its signal goes to the main mixer and the Side Chain circuitry. The
music is compressed or “ducked” under the page.
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