Allenheath ML4000 USER GUIDE User Manual download pdf (Page 49)

ML4000 User Guide 49

GRP/AUX VU Meters 1-8. Illuminated moving coil

VU (volume unit) meters display the output levels of

mix 1 to 8. Depending on the setting of the master

section mode switches these display group or aux

signals. The signal is metered post-fade, post-

mute.

MAIN LRC VU Meters. Illuminated VU meters

display the output levels of the main mix. The

signal is metered post-fade, post-mute. The meters

automatically switch to display PFL or AFL levels

when a PAFL or AFL switch is selected.

MAIN LRC Led Meters. These 16 LED bar meters

duplicate the readings of the main VU meters. They

also switch to display PFL or AFL when selected.

Sensitivity ranges from –30dB to +16dB. A 0dB

meter reading represents 0dBu at the main XLR

outputs.

Three LED colours display signal condition:

Green. Normal signal readings up to 0dB.

Yellow. Hot signal readings above 0dB and up to

12dB. Loud moments reading up to 6dB are fine.

Higher readings warn of reduced headroom.

Red. Lights at +16dB to warn that you are within

5dB of clipping and audible distortion. If this flashes

then reduce the gain or mix levels.

PAFL and AFL Indicators. These light when an

input PAFL or output AFL switch is selected. They

show that the main meters and console monitor are

switched to the P/AFL rather than main mix signals.

CALL Lamp. Lights when the intercom is being

signalled. Its large size and position in the

meterpod ensure it grabs the attention of the

operator when signalled.

MATRIX Meter Select. Press the METERS switch

in the master section to switch the right hand VU

meters to display the Matrix 1-4 rather than Aux 9-

12 output levels. The green LED in the meterpod

lights when matrix is selected.

AUX/MATRIX VU Meters. Illuminated moving coil

VU (volume unit) meters display the output levels of

Aux 9-12 or Matrix 1-4 if selected. The signal is

metered post-fade/level, post-mute.

Meter Types

Both VU and LED bar types of meter are provided

on the ML4000. This gives you the best of both

average and peak metering.

VU Meter. The VU (volume unit) meter is an

established standard for measuring audio signals.

Unlike LED meters, it is easy to read under all

lighting conditions. This makes it well suited to

outdoor festival work. It has reasonably slow

dynamics (attack and release) and is therefore good

at displaying the average music programme. It is

not able to display fast peaks and transients. The

scale is restricted between –20 and +5 to provide

good resolution around average reading. A reading

of ‘0’ represents 0dBu at the main outputs.

LED Bar Meter. This meter comprises a ladder of

LEDs each set to light when the signal reaches its

preset level. It has the advantage of much faster

dynamics and can show the musical peaks and

transients. The scale is extended to read from a

low –30 to a very high +16 which represents a peak

warning 5dB before clipping.

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Allenheath ML4000 USER GUIDE User Manual Page 49

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