COMPRESSOR/LIMITER GC2020C Owner’s Manual Mode d’emploi Bedienungsanleitung Manual del propietario GAIN REDUCTION 0 SIGNAL PEAK EXP GATE THRESHOLD RATIO 4 –4 GC2020C COMP/LIMITER 0 10 0 10 0.3 10 1 1 00 RELEASE 5 20 –16 –24 3 2 –8 COMP ATTACK 8 0.2 0.1 ms CHANNEL A 20 0.05 sec INPUT GAIN REDUCTION 0 –4 –8 OUTPUT 0.5 1 2 0 10 0 10 LINK COMP SIGNAL PEAK EXP GATE THRESHOLD ATTACK 8 3 0 10 0 10 0.3 00 0.2 0.1 ms CHANNEL B 20 0.
i Welcome to the GC2020C Compressor/Limiter Introduction Thank you for choosing the Yamaha GC2020C Compressor/Limiter. The GC2020C is a 2-channel high-performance compressor/limiter designed for professional recording and sound reinforcement applications. The GC2020C provides a wide variety of control features for precise tailoring of compression and limiting parameters. It also features an expander gate to eliminate source noise that can be accentuated by the compression process.
ii Precautions Avoid excessive heat, humidity, dust, and vibration Keep the unit away from locations where it is likely to be exposed to high temperatures or humidity—such as near radiators, stoves, in direct sunlight, etc. Avoid locations that are subject to excessive dust accumulation. Extreme vibrations can cause mechanical damage. Avoid physical shocks Strong physical shocks can damage the unit. Handle it with care.
What’s a Compressor/Limiter? 1 What’s a Compressor/Limiter? This section explains the main functions of the Compressor/Limiter. Its parameters, setup procedure, and the expander/gate. Compressor/Limiter Functions Compressor Limiter Generally, a compressor is used to fit a large signal into a small space.
2 Compressor/Limiter Parameters Compressor/Limiter Parameters Threshold Level Attack Time Threshold is the signal level at which compression or limiting begins. All signals below the set threshold level are passed as received at the INPUT jacks, with no compression or limiting applied. Signals going above the set threshold level, however, are compressed or limited according to the settings of the RATIO, ATTACK, and RELEASE controls.
3 Compressor/Limiter Parameters Release Time The Release Time determines how long it takes for the compression to return to zero once the audio signal falls below the threshold level. The RELEASE time range is from 50 milliseconds (0.05 seconds) to 2 seconds. Like the ATTACK control, the RELEASE control setting depends on the type of signal being processed and the desired effect.
4 Setting Up the Compressor/Limiter Setting Up the Compressor/Limiter 1. Set the INPUT and OUTPUT controls midway. 2. Set the Threshold Level and Ratio as appropriate for your application. 3. Adjust the OUTPUT control so that the PEAK indicator just lights up at the loudest signals. 4. Set the Attack and Release times as appropriate.
What’s an Expander/Gate? 5 What’s an Expander/Gate? The GC2020C features a expander/gate that is independent of the compressor/limiter. Expander/gate is a function that effectively eliminates hum or noise that would otherwise be heard during silent portions of the program. It works by closing the gate to cut off the output signal when the input signal falls below a specified level (the gate threshold level).
6 Controls & Connections Controls & Connections Front Panel AB GAIN REDUCTION 0 SIGNAL PEAK EXP GATE THRESHOLD RATIO 4 –4 3 0 10 0 10 0.3 10 1 1 00 RELEASE 5 20 –16 –24 8 2 –8 COMP ATTACK 0.2 0.1 ms 20 0.05 sec INPUT GAIN REDUCTION 0 –4 –8 OUTPUT 0.5 1 2 0 10 0 LINK 10 COMP RATIO 4 ATTACK 8 3 0 10 0 10 0.3 10 1 00 1 RELEASE 5 20 2 –16 –24 CHANNEL A SIGNAL PEAK EXP GATE THRESHOLD 0.2 0.1 ms 20 0.05 sec INPUT POWER OUTPUT 0.
Rear Panel 7 C OUTPUT control This controls the output level. When the input signal is compressed by the compressor/limiter, it may appear to have diminished in volume. This knob adjusts the level of the signal that has been processed by the compressor/limiter. While turning the COMP switch ON/OFF, adjust the OUTPUT control so that the volume of the bypassed and processed signals is the same.
8 Specifications Specifications Frequency Response 0+1 dB 20 Hz— 20 kHz @+4 dB –3 Link OFF/ON Total Harmonic Distortion Less than 0.05% (THD + N) 20 Hz — 20 kHz @+4 dB Controls (per CH.) Input Level, Output Level, Exp. Gate (with ON/OFF switch), Comp.
Specifications 9 SIDE CHAIN Characteristics Connection Actual Load Impedance For Use With Nominal Sensitivity SIDE CHAIN IN 27 kΩ 600 Ω Lines +4 dB (1.23 V) Connection Actual Source Impedance For Use With Nominal SIDE CHAIN OUT 600 Ω 10 kΩ Lines Input Level Maximum Before Nominal Clipping +4 dB (1.23 V) +20 dB (7.75 V) Output Level Maximum Before Nominal Clipping +4 dB (1.23 V) +20 dB (7.
10 Block Diagram Block Diagram HA CHANNEL A VCA INPUT +4dB OUTPUT COMP INPUT +4dB OUTPUT SIGNAL CHANNEL A PEAK OUT SIDECHAIN IN COMP RATIO ENVELOPE GENERATOR VOLTAGE SHIFTER 0 THRESHOLD -4 INT ATTACK -8 RATIO RELEASE -16 -24 (to CH B) EXT GAIN REDUCTION LINK KEY f(x)=1/x EXP GATE EXP GATE EXP GATE (to CH B) CHANNEL B HA VCA INPUT +4dB OUTPUT COMP INPUT SIGNAL CHANNEL B OUT SIDECHAIN IN GC2020C Compressor/Limiter Owner’s Manual +4dB OUTPUT PEAK
GC 2020C m R1 1 IP 52 Printed in China YAMAHA CORPORATION P.O.