Manual Allen-Heath PA-CP Series (page 28 of 36) (English)

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28 PA-CP User Guide

The MASTER Connectors

TRS Line Outputs ¼” jack line level outputs which

produce 0dBu when the console meters read ‘0’. With a

maximum output level of +21dBu there is plenty of headroom

available. They are impedance balanced and can be used with

balanced or unbalanced equipment.

 TRS jack refers to the popular 3-pole stereo ¼” phone

jack. It is so called because it has three contacts: tip, ring and

sleeve. It is used with balanced audio signals (tip hot, ring

cold), stereo signals (tip left, ring right), or single jack inserts

(tip send, ring return). The 2-pole mono TS jack is used with

unbalanced signals.

 Line level refers to audio signals in the region of 1 volt.

For comparison, Mic level refers to very low level signals in the

order of millivolts, and Speaker level refers to amplifier output

levels in the order of tens of volts. Several line level standards

exist. These refer to the ‘nominal’ operating level, the point at

which the meters read ‘0’. Professional audio equipment

generally works at 0dBu (0.775V) or +4dBu (1.23V), while

semi-professional or consumer equipment often works at the

lower -10dBV (0.31V). The PA Series has a very wide dynamic

range making its 0dBu referenced outputs well suited to

working with these standards.

☺ Using line level signals Use these outputs to feed line

level equipment such as amplifier, signal processor, recorder

and IEM transmitter inputs. Do not connect them directly to

loudspeakers, or to phantom powered inputs. Adjust the

sensitivity of the connected equipment to match the normal

0dBu operating level of the console.

 Impedance balanced outputs, like differential

electronic balanced drivers, use a 3 wire connection and

provide the benefit of interference rejection when plugged into

balanced equipment inputs. The signal is carried on the tip

and is referenced to ground on the sleeve. Unlike the

electronically balanced connection, the ring does not carry

signal. However, it is held at the same impedance as the tip

signal wire. This means that interference is injected equally

into both the tip and ring wires and cancels out when plugged

into a balanced input leaving the audio signal unaffected.

☺ Using balanced or unbalanced connections Use

balanced 2-core plus screen connections when you connect

the outputs to balanced equipment with cables longer than 10

meters. The PA Series outputs work at line voltage and very

low impedance making unbalanced single core plus screen

connections suitable for short cable runs as these are seldom

prone to interference. To reduce interference pickup avoid

running the cables near to or alongside mains power, lighting

or computer equipment and cables.

FB1, FB2 OUT Use these pre-fade aux sends to drive

two independent foldback monitor amplifiers, or transmitters if

you are using in-ear monitors (IEM).

AUX Use this post-fade aux send to drive an external effects

unit, or for a special feed such as mono recording, audio for

video feed or additional speaker zone.

FX This output follows the channel post-fade sends to the

internal effects unit. Use it when you are not using the internal

effects unit, or to feed an external effects unit at the same time

for layered effects.

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Allen-Heath PA-CP Series Manual

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