User guide

ManualsBrandsALLEN & HEATH Manualsaudio & home theatreW31222

12M User Guide 15

MIX SENDS These rotary controls adjust how much channel signal

is sent to the 12 mix outputs. Each has its own control. They adjusts

from fully off to +6dB boost. Unity gain 0dB is marked at 3 o’clock

position. Factory default settings should satisfy the most common

applications:

All sends = Post-EQ

Sends 1-4 = Switched pre/post using POST/PRE switch

Sends 8-12 = Post-trim (post-fade)

Some of these settings may be changed if preferred by soldering

internal jumper link options. Refer to the system block diagram for

further information on these options. This work should be referred to

an authorised Allen & Heath service agent..

POST/PRE When pressed, the pre-trim (fade) channel signal is

sent to auxes 1-4. When released the post-trim signal is sent.

In monitor mixing, the channel sends are usually set post-trim. This

means the channel trim control (fader) can be used as a master level

for that source feeding all mixes.

Stereo or Mono Odd/even pairs of mixes can be configured for

mono or stereo operation by setting a recessed mode switch near the

master faders. In MONO mode two independent sends are available.

In stereo mode, the odd numbered send becomes a stereo level

control and the even send becomes a pan control to position the sound

within the stereo LR image. Any combination of mono and stereo

mixes may be configured. Before starting, configure how you want the

console to work by setting the STEREO switches in the master section.

MUTE When pressed the channel signal is turned off. This affects

the feed to all mixes but does not affect the insert send. The red

indicator lights when the channel is muted.

CHANNEL TRIM This is the channel fader. Use the control to

adjust the level feeding all post-trim mix sends. It lets you make an

adjustment to compensate for a change in source level, to make a

quick level change affecting all mixes, or deal with a problem such as

feedback. Alternatively you could use it to create a starting point mix

for several monitors. For normal operation, start with CH TRIM set to

its 0dB (unity gain) position (3 o’clock – marked with an arrow).

PFL Press PFL to listen to the pre-trim channel signal in the

headphones and local engineer’s monitor without affecting the mix

outputs. The PFL signal overrides and currently selected mix AFL

signal. The console monitor LR meters display the channel signal.

The red PK indicator half lights to show that PFL has been selected on

that channel. Selecting more than one PFL at the same time mixes

those signals together in the monitor.

PEAK The red indicator illuminates when the channel signal is

within 5dB of clipping. This gives you enough warning to reduce the

GAIN control before you hear signal distortion. It senses the audio at

three points in the signal chain – pre-insert, pre-trim and post-trim.

SIGNAL The green signal presence indicator lights when the

channel pre-fade signal is greater than -12dBu.

PK!

MUTE

PFL

SIG

PAD

+48V

HPF

+15

15k

-15

500Hz

700

(LINE)

+15

250

400

-15

35Hz

180

+15

-15

CH TRIM

OO +6

POST

PRE

EQ IN

MIX

PAN

MIX

PAN

MIX

PAN

MIX

PAN

MIX

PAN

MIX

PAN

MIX

10- 10

GAIN

4060