Bedienungsanleitung Allen-Heath PA-CP Series (Seite 18 von 36) (Englisch)

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18 PA-CP User Guide

The STEREO Channel

Dual Stereo Inputs Each stereo channel has two

independent stereo inputs, ST1(3) and ST2(4). For

convenience, one uses RCA phono connectors, the other uses

TRS jacks. The two inputs mix together to feed the channel

strip, or ST1(3) can be routed direct to the LR mix instead,

leaving ST2(4) to feed the channel. This provides a very

flexible arrangement for mixing up to four stereo sources.

ST1(3) INPUT RCA phono inputs for connecting line

level stereo signals. These connectors are popular with

consumer and semi-professional equipment such as tape

deck, video camera, computer, CD and MiniDisc players.

ST2(4) INPUT TRS jack inputs for connecting line level

stereo signals. The inputs are unbalanced but can also accept

balanced sources. The ring connection grounds the –ve (cold)

signal to unbalance a connected balanced source. Typical

applications include stereo keyboards, voice modules, effects

processors and sub mixers.

☺ Using the stereo channels These inputs are intended

for local stereo sources. The unbalanced connections work

fine with the higher voltage levels and low impedance

associated with such equipment. If you need to connect

equipment further than 10 metres away we recommend you

use the mono channel balanced line inputs or DI boxes feeding

the long cables to the mic inputs.

ST1(3) Mode Switch This small switch is recessed to

prevent accidental operation once it is set. In its up position it

is flush with the panel and mixes the ST1(3) signal with ST2(4)

to feed the stereo channel. Use a pen or similar pointed object

to press the switch if you want to route the ST1(3) signal direct

to the LR mix instead of the stereo channel.

☺ Mixing two stereo signals into the channel (Switch

flush with panel). There are many situations where it is

convenient to combine two sources into one channel. For

example, you may have two MiniDisc players being used for

backing tracks or sound effects, a stereo keyboard together

with additional MIDI controlled voice module, two effects

processors returning into one effects channel, or simply two

unrelated sources being used at different times. Use the two

GAIN controls to adjust the balance between the sources.

☺ Sending ST1(3) direct to LR (Switch pressed, below

panel). Some sources may only require ‘set and forget’ routing

to the main LR mix. For example, an external reverb processor

return with its levels mixed using the channel aux sends, or the

outputs of a stereo sub mixer with local control of its mix.

Routing ST1(3) in this way frees up the stereo channels for

other sources. Adjust the level using the ST1(3) GAIN control

from fully off to +10dB boost.

GAIN Adjusts the sensitivity of the channel preamp to

match the connected source to the 0dBu operating level of the

console. The control has a range from fully off to +10dB boost

so that sources from -10dBu and higher can be connected.

☺ Setting the gain Use the channel PFL function to view

the signal level on the console meters. Adjust the gain control

for average signal level around meter ‘0’ with loudest peaks no

more that ‘+6’. If you see the channel PEAK indicator flash

back the gain off a little.

11-12

-20

-30

-10

-20

-30

-10

ST2/4

GAIN

ST1/3

GAIN

CHAN

STEREO CHANNEL

SUM

TO LR

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