Bedienungsanleitung Allen-Heath GL 3300 (Seite 5 von 20) (Englisch)

541351

Zoom out

Zoom in

Vorherige Seite

1/20

Nächste Seite

GL3300 U

SER

UIDE

EARTHING THE AUDIO SYSTEM

The console chassis is connected to mains earth via the DC power cable. Audio 0V is connected to the

chassis and therefore mains earth. In this way all signal returns and connector shields are connected to

mains earth at the console.

To ensure operator safety do not remove the earth connection

from the power supply mains plug.

For best performance it is important that the earth system is solid, clean and noise-free. To prevent mains

born and external interference pickup from lighting equipment, motors and other mains powered

equipment it is recommended that a separate 'clean' mains distribution outlet is used for the audio system.

All signal cables should have their screens connected to earth at the connector. If earth (ground) loop

problems result in audible hum or buzz then disconnect the cable screen connection at one end, usually the

destination end. This may be done within the cable plug or by operating the 'ground lift' switch if available

on the connected equipment. Many DI boxes and power amplifiers include this facility.

PLUGGING UP THE CABLES

Where possible use balanced connections to prevent noise and interference pickup especially on long

microphone cable runs. Avoid running audio cables next to mains, computer or lighting cables, or near

thyristor dimmer units, power supplies etc. The use of low impedance sources such as good quality

microphones of 200 ohms or less significantly reduces interference pickup. Many problems can be avoided

by taking time to check that all cables are correctly wired (in-phase) with professional quality cable and

carefully soldered joints. The following wiring convention is used:

Switch off the input channel +48V when using non-phantom

powered, line or unbalanced sources.

ADJUSTING THE LEVELS

For best performance it is important that the connected source signals are matched to the "normal operating

level" of the console. Similarly the console outputs should be correctly matched to the operating levels

of the connected amplifiers and destination equipment. If too high the signal peaks will be clipped

resulting in a harsh distorted sound, and if too low the signal-to-noise ratio is reduced resulting in excessive

background hiss.

For best results operate the console with the meters averaging '0' or just below and allowing the loudest

passages and occassional peaks into the 'yellow'. Reduce the gain if the peak indicators flash (red). The

GL3300 produces a standard XLR output level of +4dBu for a meter reading of 0VU. It is advisable to

adjust the power amplifier input gain or fit an attenuator pad if normal console operation results in an output

level too high for the connected amplifier. Normal operation should result in fader levels around the '0'

mark.

The GL3300 has an advanced PFL (pre-fade listen) / AFL (after-fader listen) and channel metering

system to let you listen to and check the level of signals at different points in the signal path without

affecting the main outputs. Use the channel PFL switches to set up the input GAIN controls to read an

average '0' (yellow LED). Signal activity is always shown on the channel meters regardless of fader mute

switch position. The green 'SIG' LED lights at -20dBu to indicate signal presence, the green '0' LED

indicates normal level, and the red 'PEAK' LED warns of potential overload 5dB before clipping.

XLR pin 1 = 0V earth shield

pin 2 = hot (+ve - in phase signal)

pin 3 = cold (-ve - out of phase signal)

1/4" jack tip = hot / +ve/signal / left / send

ring = cold /-ve/ 0V / right/ return

sleeve = 0V earth shield

To connect an unbalanced source to a balanced console input, link the cold input (XLR pin 3 or jack ring)

to 0V earth (pin 1 or jack sleeve) at the console. To connect a balanced console output to an unbalanced

destination link the cold output to 0V earth at the console.

Missbrauch melden von Frage und/oder Antwort

Libble nimmt den Missbrauch seiner Dienste sehr ernst. Wir setzen uns dafür ein, derartige Missbrauchsfälle gemäß den Gesetzen Ihres Heimatlandes zu behandeln. Wenn Sie eine Meldung übermitteln, überprüfen wir Ihre Informationen und ergreifen entsprechende Maßnahmen. Wir melden uns nur dann wieder bei Ihnen, wenn wir weitere Einzelheiten wissen müssen oder weitere Informationen für Sie haben.

Allen-Heath GL 3300 Seite 5

Brauchen Sie Hilfe? Stellen Sie Ihre Frage.

Missbrauch melden von Frage und/oder Antwort

Art des Missbrauchs:

Forenregeln

Neu registrieren

Das Handbuch wird per E-Mail gesendet. Überprüfen Sie ihre E-Mail.

Ihre Frage wurde zu diesem Forum hinzugefügt

Info