Bedienungsanleitung Allen-Heath PA-CP Series (Seite 29 von 36) (Englisch)

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PA-CP User Guide 29

LR MAIN OUT Use these line outputs to drive the main

house amplifiers if you are using the console AB amplifiers for

the foldback monitors. If the AB amps are powering the house

speakers you could also use the LR outputs to feed booster

amplifiers for additional speakers in the system.

MONO OUT The main L and R outputs are summed

together to produce a mono line level output. Typical

applications include feeding an external amplifier for a mono

PA, a fill or zone speaker, or driving a sub bass

amplifier/speaker system (sub filter switched in). Its level is

affected by the LR fader which is used as the main PA level

control.

☺ Working with powered speakers A powered speaker is

a loudspeaker with a power amplifier built into its cabinet.

These can be convenient to use with small portable systems as

they save space. Simply feed the console TRS outputs to the

powered speaker line inputs. You could, for example, use the

console AB amplifiers to drive conventional house PA

speakers, the FB1 and FB2 outputs to drive a couple of small

powered foldback speakers, and MONO to drive a powered

sub bass. To avoid problems such as ground loops make sure

the mains power supply feeding the speakers is on the same

circuit as that feeding the console.

LR INSERTS One TRS jack socket for each side of the

main LR mix lets you patch in external processing equipment

such as a stereo limiter, equaliser or delay unit. Plugging in

interrupts the signal path after the mix stage and before the LR

fader. With nothing plugged in, the signal is routed through the

switching contact within the socket. The connection is

unbalanced with both the insert send and return signals

presented on the same jack. Connect the equipment input

from the send (TRS jack tip), and its output to the return (jack

ring). Wire both cable shields to the jack sleeve. The insert

operates at 0dBu line level. Ensure that the external equipment

is set to operate at similar level and unity gain. The diagram

below shows a typical insert cable with plug links to unbalance

the external equipment connections if they are balanced.

HEADPHONES The console monitoring system has a

built-in stereo headphone amplifier which feeds a TRS output.

It is wired conventionally with tip = left, ring = right. Plug in a

standard pair of stereo headphones.

☺ Choosing headphones For best performance, clarity

and reliability we recommend you use a high quality, closed

ear design with impedance in the range 30 to 600 ohms.

Lower impedance headphones such as the popular 100 ohms

types usually produce a louder output. Avoid using the

cheaper types that come with portable music players and

consumer equipment.

To prevent damage to your hearing, avoid continued

high listening levels in the headphones.

Console LAMP A 4-pin XLR connector is provided on

the rear panel for plugging in a gooseneck lamp to illuminate

the control surface when working in a dark environment. Use a

lamp with 12V bulb up to 5W power designed for this purpose.

To prevent damage to the console power unit do not

attempt to modify the lamp connection or add more lamps.

L R

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Allen-Heath PA-CP Series Seite 29

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