Bedienungsanleitung Allen-Heath ML 3000 (Seite 25 von 48) (Englisch)

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ML3000 User Guide 25

PFL. Press this switch to listen to the channel pre-

fade signal in the headphones or engineers monitor

without affecting the main outputs.

The signal is displayed on the main C LED bar and

VU meters when PFL is active. To avoid confusion

the L and R meters are turned off while PFL is

active.

PFL override AFL override monitor source.

Pressing any input PFL automatically overrides any

currently selected output AFL or monitor source.

Releasing PFL restores that selection. This logic is

ideal for quickly checking channel signals while

monitoring a selected mix.

INPUT SIGNAL METER. The channel meter

displays the pre-fade signal level. It is conveniently

positioned near the fader to draw your attention to

signal activity associated with each channel fader.

The SIG LED lights to display signal presence at a

low –26dB. 0 and +6 display normal signal level,

and PK (peak) lights when the signal is within 5dB

of clipping. PK senses the signal at 3 critical stages

in the signal path, pre-insert, post-EQ pre-fader and

post-fader, to warn of potential overload. PK can

flash, for example, if the preamp is clipping while

signal reads low due to attenuation through an

inserted processor.

Checking the Channel Signal Level

When plugging in a new source start with the

channel muted or fader and sends turned down.

This prevents any unexpected signal in the

loudspeakers. Adjust the channel GAIN control for

an average channel meter reading of ‘0’ with loud

moments lighting ‘+6’. Select PAD if the signal is

still too high with gain turned down. Reduce the

gain if the signal meter red PK LED lights. It may

be necessary to re-adjust the gain if changes are

made to the equaliser or inserted signal processing.

If the PK LED lights with channel meter reading low

then check the channel for correct gain structure, in

particular the equaliser and inserted equipment

settings.

Select channel PFL to check the signal quality in

the headphones while the fader is off or channel

muted. The signal is also displayed on the main C

VU and LED bar meters providing finer resolution

and dynamic indication.

FADER. A 100mm smooth travel ALPS fader

provides +10dB gain above the nominal 0dB

operating position. Audio is not passed through the

fader. Instead, its position is read by the console

computer which produces a DC voltage sent back

to the channel to control the level of the its VCA.

The VCA replaces a conventional audio fader.

VCA GROUP Indicator. The yellow LED indicator

next to the fader lights when the channel is

assigned to one or more VCA groups.

It is also used during VCA and mute group

assignment to display channel status for individual

groups. Use the VIEW or ASSIGN functions to

check the assignment of the channel to selected

groups.

Note: If the channel is assigned to a VCA group

check that the group fader is up for normal signal. If

the channel is not muted, is routed to the mix and

have both the channel and mix faders up but no

signal then the VCA group fader may be down.

IDENT STRIP. Identifies the channel numbers and

provides a write-on area. The use of low adhesion

artist or masking tape is recommended.

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Allen-Heath ML 3000 Seite 25

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