Bedienungsanleitung Allen-Heath ML 3000 (Seite 33 von 48) (Englisch)

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ML3000 User Guide 33

MATRIX

MIX CONTROLS Each of the 4 groups, L, R and C

can be mixed into the matrix. The source is derived

post-fader. Adjust the level clockwise from fully off

to +6dB boost. The ‘0dB’ position is marked.

EXTERNAL INPUT Each matrix has its own rear

panel input socket for adding in an external signal

such as support act console or venue

announcement system. These do not have level

trim controls.

MASTER LEVEL Adjusts the matrix output level

from fully off to a maximum boost of +6dB. The

normal ‘0’ position is marked.

ON This latching switch turns the matrix master

signal on or off. The green LED illuminates when

the signal is turned on.

AFL Press this switch to listen to the matrix signal

in the headphones or engineers monitor without

affecting the main outputs. The signal is monitored

post-level, pre-ON so that it can be checked while

the output is turned off.

Using the Matrix

The matrix provides 4 additional console outputs. It

is a ‘mixer within a mixer’ taking its source from the

groups and main mix. It can be used to provide

duplicate main outputs or to create new mixes from

the main outputs. The controls are positioned

conveniently away from the live performance

controls to avoid accidental operation.

The possibilities are endless. A few applications

are discussed below:

Distributed Speaker Systems. The traditional

application for the matrix is to feed a multi-speaker

system such as that found in theatre sound

reinforcement. Use the console L,R and C outputs

to feed the main front speakers typically hung

around the proscenium arch. Use the matrix to

provide independent mixes to the under-balcony,

centre, side and rear fill speakers.

The fill speakers should be delayed to acoustically

align the signal with the stage so keeping the

listener focussed on the source of the sound. They

would also be equalised to aid intelligibility without

distracting the listener from the source. Use the

matrix INSERT sockets to patch in the external

signal processing. This lets you check the

processed signal using the console AFL system.

You may wish to send only certain groups of sound

to the fill speakers. Use the group 1-4 controls to

create the required balance, for example just the

vocal groups to improve speech intelligibility. You

could add in a small amount of the main mix with

the LRC controls using equal amounts of L and R to

create a mono mix.

Recording and Broadcast Feeds. Use the matrix

to create feeds in mono, stereo or both. It may not

be good enough to simply tap off the main console

mix, especially in smaller venues where the

acoustic output from the band back line or orchestra

contributes to the front-of-house sound. Here, the

acoustically strong sounds such as drums, bass

and guitar may be low in the front-of-house mix.

You can compensate for this in the recording using

the matrix. Start with the main LRC mix then add

the groups to boost selected sounds.

Stereo from LCR. The matrix also lets you create

stereo feeds from a 3 output LCR mix by adding C

into both channels. Use one matrix with L+C

routed, the other with R+C to feed the left and right

recording channels.

OO +6

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AFL

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LEV

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AFL

OO +6

LEV

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AFL

OO +6

LEV

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AFL

OO +6

ON ON

LEV

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Allen-Heath ML 3000 Seite 33

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