Yamaha GC2020C user manual

User manual for the device Yamaha GC2020C

Device: Yamaha GC2020C
Category: Air Compressor
Manufacturer: Yamaha
Size: 0.62 MB
Added : 8/21/2014
Number of pages: 50
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Summary of the content on the page No. 1


COMPRESSOR/LIMITER
GC2020C
Owner’s Manual
Mode d’emploi
Bedienungsanleitung
Manual del propietario
SIGNAL PEAK SIGNAL PEAK
GAIN GAIN POWER
REDUCTION REDUCTION
EXP GATE THRESHOLD RATIO ATTACK RELEASE INPUT OUTPUT EXP GATE THRESHOLD RATIO ATTACK RELEASE INPUT OUTPUT
0 0
48 35 0.3 0.5
48 35 0.3 0.5
–4 –4
20 10 20 10
1 1
2 1 0.1 2 1 0.1
–8 –8
COMP –16 LINK COMP –16
1 00 0.2 20 0.05 2 00 20 2
0 10 0 10 0 10 0 10 0 10 0 10 1 0.2 0.05 0 10 0 10
–24 ms sec –24 ms sec
GC2020C
CHANNEL A CHANNEL B
COM

Summary of the content on the page No. 2

i Welcome to the GC2020C Compressor/Limiter Introduction Thank you for choosing the Yamaha GC2020C Compres- the dynamic range. This technique can also be used with sor/Limiter. The GC2020C is a 2-channel high-performance other instruments, such as acoustic guitar, bass guitar, and compressor/limiter designed for professional recording and piano. In fact, any instrument with a wide dynamic range can sound reinforcement applications. The GC2020C provides a be recorded more easily with a

Summary of the content on the page No. 3

ii Precautions Avoid excessive heat, humidity, dust, Always use the correct power source and vibration Make sure the power source voltage specified on the rear panel matches your local AC mains supply: Keep the unit away from locations where it is likely to be exposed to high temperatures or humidity—such as near US & Canadian Model: 120V AC, 60 Hz radiators, stoves, in direct sunlight, etc. Avoid locations that General Model: 230V AC, 50 Hz are subject to excessive dust accumul

Summary of the content on the page No. 4

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 Limiting is basically extreme compression that is set to affect small space. Specifically, in a situation where the dynamic only signals above a certain level. This is particularly useful range

Summary of the content on the page No. 5

2 Compressor/Limiter Parameters Compressor/Limiter Parameters Threshold Level Attack Time Threshold is the signal level at which compression or limit- The Attack Time determines how long it takes—in millisec- ing begins. All signals below the set threshold level are onds—before the full amount of compression is applied passed as received at the INPUT jacks, with no compression once the threshold level is exceeded. The ATTACK time or limiting applied. Signals going above the set

Summary of the content on the page No. 6

Compressor/Limiter Parameters 3 • The compressor/limiters use the Threshold Level setting Release Time of the channel whose level setting is higher. The Release Time determines how long it takes for the com- • The expander/noise gates use the Threshold Level setting pression to return to zero once the audio signal falls below of the channel whose level setting is lower. the threshold level. The RELEASE time range is from 50 mil- • For Attack Time and Release Time, the channel with

Summary of the content on the page No. 7

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. GC2020C Compressor/Limiter Owner’s Manual

Summary of the content on the page No. 8

What’s an Expander/Gate? 5 What’s an Expander/Gate? The GC2020C features a expander/gate that is independent Normally you will set the gate level below the lowest level of of the compressor/limiter. Expander/gate is a function that the musical portion, so that the gate will always be “open” effectively eliminates hum or noise that would otherwise be during the music to let the signal pass. Hum or noise that is heard during silent portions of the program. It works by lower in level than t

Summary of the content on the page No. 9

6 Controls & Connections Controls & Connections Front Panel AB SIGNAL PEAK SIGNAL PEAK GAIN GAIN POWER REDUCTION REDUCTION EXP GATE THRESHOLD RATIO ATTACK RELEASE INPUT OUTPUT EXP GATE THRESHOLD RATIO ATTACK RELEASE INPUT OUTPUT 0 0 48 35 0.3 0.5 48 35 0.3 0.5 –4 –4 20 10 1 20 10 1 2 2 1 0.1 1 0.1 –8 –8 COMP –16 LINK COMP –16 0 10 0 10 1 00 0.2 20 0.05 2 0 10 0 10 0 10 0 10 1 00 0.2 20 0.05 2 0 10 0 10 ms sec –24 ms sec –24 CHANNEL A CHANNEL B ON OFF 2 3

Summary of the content on the page No. 10

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/lim- iter. While turning the COMP switch ON/OFF, adjust the OUTPUT control so that the volume of the bypassed and processed signals is the same. Rear Panel CHANNEL B CHANNEL A OUTPUT INPUT OUTPUT INPUT SIDECHAIN SIDECHAIN +4dB

Summary of the content on the page No. 11

8 Specifications Specifications +1 Frequency Response 0 dB 20 Hz— 20 kHz @+4 dB Link OFF/ON –3 Total Harmonic Distortion Less than 0.05% (THD + N) Controls Input Level, Output Level, 20 Hz — 20 kHz @+4 dB (per CH.) Exp. Gate (with ON/OFF switch), Comp. Ratio, Threshold Level, Attack Time, Release Time, Comp switch Hum & Noise (Average, –85 dB Power 20W Rs=600 Ω ) (Measured with Consumption BPF 20 Hz — 20 kHz) Compression Ratio 1 : 1 — ∞ : 1 Power USA and Canada (Maximu

Summary of the content on the page No. 12

Specifications 9 SIDE CHAIN Characteristics Input Level Actual Load For Use With Connection Sensitivity Connectors Maximum Before Impedance Nominal Nominal Clipping SIDE CHAIN IN 27 kΩ 600 Ω Lines +4 dB (1.23 V) +4 dB (1.23 V) +20 dB (7.75 V) phono Output Level For Use With Connection Actual Source Impedance Connectors Maximum Before Nominal Nominal Clipping SIDE CHAIN OUT 600 Ω 10 kΩ Lines +4 dB (1.23 V) +20 dB (7.75 V) phono In these specifications, when dB represents a specific voltage, 0 d

Summary of the content on the page No. 13

10 Block Diagram Block Diagram HA CHANNEL A VCA OUTPUT INPUT +4dB COMP +4dB INPUT OUTPUT SIGNAL PEAK CHANNEL A OUT SIDECHAIN IN ENVELOPE COMP VOLTAGE GENERATOR RATIO SHIFTER 0 THRESHOLD -4 INT -8 ATTACK RELEASE RATIO -16 -24 (to CH B) EXT GAIN REDUCTION LINK KEY f(x)=1/x EXP GATE EXP GATE EXP GATE (to CH B) HA CHANNEL B VCA OUTPUT INPUT +4dB COMP +4dB INPUT OUTPUT SIGNAL PEAK CHANNEL B OUT SIDECHAIN IN GC2020C Compressor/Limiter Owner’s Manual

Summary of the content on the page No. 14

i COMPRESSOR/LIMITER GC2020C Mode d’emploi Bienvenue au Compresseur/Limiteur GC2020C Avant-propos Merci d’avoir porté votre choix sur un Compressor/Limiter presseur sert à réduire la dynamique d’un signal. Cette tech- GC2020C de Yamaha. Le GC2020C est un compresseur/lim- nique permet en outre de maîtriser des instruments tels que iteur professionnel à deux canaux qui convient tant pour les des guitares, des basses ou un piano acoustique. Par ailleurs, enregistrements audio que pour des t

Summary of the content on the page No. 15

ii Précautions Evitez toute exposition à une chaleur, Assurez-vous que l’appareil est hors une humidité, une quantité de tension avant d’effectuer ou de poussière et de vibrations excessives supprimer des connexions Evitez de placer l’appareil dans un lieu exposé à des tempéra- Mettez toujours les appareils concernés hors tension avant de tures élevées ou une forte humidité (évitez la proximité de brancher et de débrancher des câbles. C’est vital pour éviter radiateurs, poê

Summary of the content on the page No. 16

Qu’est-ce qu’un Compresseur/Limiteur? 1 Qu’est-ce qu’un Compresseur/Limiteur? Cette section décrit les fonctions principales du Compresseur/Limiteur ainsi que ses paramètres, sa procédure d’installation et les effets Expandeur/Gate. Fonctions du Compresseur/Limiteur Compresseur Limiteur Généralement, un compresseur sert à faire passer un signal Un limiteur est en fait un compresseur à taux de compres- important dans un espace restreint. Plus spécifiquement, sion extrême, réglé po

Summary of the content on the page No. 17

2 Paramètres du Compresseur/Limiteur Paramètres du Compresseur/Limiteur Niveau seuil (Threshold) Temps d’attaque (Attack Time) Le seuil est le niveau du signal auquel la compression ou la Le temps d’attaque détermine le temps qu’il faut (en millise- limitation commence. Tous les signaux dont le niveau reste condes) pour que la quantité complète de compression soit inférieur au seuil sont transmis tels qu’ils ont été reçus, sans appliquée une fois le niveau seuil dépassé. La pla

Summary of the content on the page No. 18

Paramètres du Compresseur/Limiteur 3 • Le Compresseur/Limiteurs se sert du réglage du niveau Temps de relâchement (Release Time) seuil (Threshold) du canal dont la valeur est la plus élevée. Le temps de relâchement détermine le temps qu’il faut pour • L’expandeur/noise gate se sert du niveau seuil (Thres- que la compression revienne à zéro une fois que le signal audio hold) du canal dont la valeur est la plus basse. tombe sous le niveau seuil. La plage du temps de relâchement • Pour

Summary of the content on the page No. 19

4 Réglage du Compresseur/Limiteur Réglage du Compresseur/Limiteur 1. Réglez les commandes INPUT et OUTPUT au centre. 2. Réglez le niveau seuil (Threshold) et le taux (Ratio) en fonction de l’usage que vous allez en faire. 3. Réglez la commande OUTPUT de sorte que le témoin PEAK ne s’allume que pour les niveaux les plus élevés. 4. Réglez les temps d’attaque et de relâchement (Attack et Release) comme vous l’entendez. GC2020C Compresseur/Limiteur Mode d’emploi

Summary of the content on the page No. 20

Qu’est-ce qu’un Expandeur/Gate? 5 Qu’est-ce qu’un Expandeur/Gate? Le GC2020C comprend un Expandeur/Gate qui est indé- niveau spécifié (le niveau seuil du Gate). Normalement, ce pendant du Compresseur/Limiteur. L’Expandeur/Gate est niveau est inférieur au niveau le plus bas de la portion musi- une fonction qui élimine tout bourdonnement ou bruit de cale afin de laisser passer le signal. Le bourdonnement ou fond audibles lors des parties silencieuses du programme. Sa bruit dont le niveau est


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