Manual Allen-Heath PA-CP Series (page 25 of 36) (English)

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PA-CP User Guide 25

MONO OUT LEVEL This is the master

control for the console mono output. The LR mix is

summed after the LR faders to produce the mono

signal. Use the control to adjust the balance

between the LR and MONO feeds. Once set, use

the LR fader as the house volume control affecting

the LR and MONO outputs. The control ranges from

fully off to +6dB boost above its unity gain position.

SUB FILTER Press to switch in the 100Hz low

pass filter. This is a built-in crossover filter to

condition the mono output for driving a sub bass

amplifier/speaker. Frequencies above 100Hz are

rolled off at 12dB per octave. The switch is recessed

to prevent accidental operation once set. Use a pen

or sharp object to change its position.

 Sub bass speakers are large coned drivers,

typically 15” or 18”, built into reasonably large

cabinets designed to reproduce the very low

frequencies. They are referred to as ‘subs’. They

are not used by themselves. Smaller speakers often

referred to as the ‘tops’ are added to reproduce the

mid and high frequencies. Without a filter the sub

can reproduce frequencies as high as 500Hz or

more. This can cause a sub/top combination to

sound ‘boxy’ or ‘muddy’. For this reason a filter is

added to cut frequencies above the required

frequency range, usually around 100Hz. This filter

may be built into the sub cabinet, its amplifier or a

separate crossover unit. The PA Series adds the

switchable 100Hz filter for situations where no filter is

provided. Check your sub speaker instructions to

see if it is needed.

Background Music (BGM) The console

provides a facility for playing an independently

controlled stereo music source such as CD through

the house speakers while the main LR faders are off.

This is ideal during walk in or while taking a break

during intermission.

BGM Routes the 2-track input to the LR outputs

after the master fader but before the mute switch.

This means that the signal is not affected by the

fader but is turned off when MUTE is pressed. A

large green LED lights when BGM is selected.

2TRK TO LR Controls the level of the 2 track

signal to the LR output from fully off to +6dB boost

above ‘0’. It has no effect if the BGM switch is off.

To avoid feedback do not use BGM if you

are using the 2-track input to monitor a recording

being made from the LR mix.

2TRK OUT Selects the 2-track output feed to

be pre or post LR faders. It affects both the

analogue and digital (SPDIF) outputs. In its normal

up position the source follows the fader movements.

When the switch is pressed, the LR faders can be

used as the house PA volume control without

affecting the recording. The switch is recessed to

prevent accidental operation once set. Use a pen or

sharp object to select its position.

STANDBY Pressing this switch puts the

console amplifiers into protect mode by isolating the

speakers. You should hear the relays click as the

amplifier outputs are disconnected. The large red

LED and two AB amplifier PROTECT LEDs light

while standby is selected. Use STANDBY to protect

the speakers while plugging equipment or leaving

the console unattended.

Console Monitor The PA Series monitor

system lets you listen to the various console signals

using headphones, and check levels on two large

LED bar meters. Using the monitor does not affect

the main outputs.

HEADPHONES LEVEL Controls the

volume of the selected monitor source in the

headphones. It does not affect the level displayed

on the meters.

WARNING: To prevent damage to your

hearing start with the headphones level set to

minimum. Avoid continued high listening levels

in the headphones or any other earpiece.

LR/2TRK Selects the normal headphones and

meter monitor source. In its up position the post-

fade LR signal is selected. When pressed, the 2-

track input is monitored. Pressing any PFL or AFL

button automatically overrides this selection.

PFL/AFL LED A large red LED indicator lights

to warn you when a PFL or AFL has been selected.

METERS A pair of 12 segment LED bar meters

displays the level of the selected monitor source.

The LR mix and 2-track input are displayed in stereo,

and PFL/AFL signals in mono on both bars.

 PFL stands for Pre-Fade Listen. It is used on

the inputs so that you can check the signal while the

channel is muted or its fader down.

 AFL stands for After Fade Listen. It is used

on the outputs so that you can check the signal

exactly as it is at the console outputs.

☺ Using PFL and AFL Use PFL to check sound

quality and the channel gain setting when plugging

in different sources or when you suspect a change

or problem with a particular signal. Use AFL when

you need to check one of the foldback mixes. You

should hear the signal in your headphones and see

its level displayed on the console meters. Adjust the

gain and mix controls so that the meters read an

average ‘0’ with loudest peaks no more than ‘+6’.

10k1kHz100 30k

-35

-40

-30

-25

-20

-15

-10

-5

0dB

+10

100Hz

MONO SUB FILTER

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Allen-Heath PA-CP Series Manual

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