Allenheath ML4000 USER GUIDE User Manual download pdf (Page 45)

ML4000 User Guide 45

OSC/NOISE GENERATOR

WARNING: The generator is capable

of producing a high level continuous signal. To

avoid damage to the speakers check that the

generator and output levels are turned down

before you route the test signal to the outputs.

OSC/NOISE TRIM. Adjusts the level of the

oscillator or noise signal from –30 to +10dB.

OSC/NOISE SELECT. In its up position pink noise

is selected as the generator source. Press to select

the 1kHz test tone.

Pink noise. This is a constant level random noise

signal with equal energy per octave covering the full

audio bandwidth.

1kHz Oscillator. This produces a pure 1kHz tone

(sine wave) for single frequency testing and line up.

OSC/NOISE TO TB. Press this switch to route the

pink noise or 1kHz tone test signal to any

combination of LR, C, Matrix and Grp/Aux outputs

that have their TB switches selected. The switch

has a latching action so that it can remain selected

while testing and calibrating the speakers.

DISABLE. Press the underpanel switch to disable

the osc/noise generator. This protects against

accidental operation during live performance.

Using the Osc/Noise Generator

Start with the TRIM control turned down. Select

either pink noise or the 1kHz tone as the test signal.

Check all the TB enable switches are correctly set

to route the signal to the required outputs. Make

sure the DISABLE switch is up (flush with the

panel). Press OSC/NOISE TO TB to route the

signal to the selected outputs. Raise the TRIM

control and output faders to achieve the level

required. The test signal should register on the

console meters in the normal way.

Use pink noise to test the speakers for correct

operation. This is made up of the full audio

bandwidth and can test all the drivers at the same

time. Used with a reference microphone and RTA

(real time analyser) you can check the venue

acoustics for frequency response.

Use the 1kHz tone to check matching and line up

between equipment by adjusting input and output

levels using the meters as the reference.

When you have finished using the generator be

sure to disable it if you want to avoid the possibility

of accidental operation during performance.

OSC/NOISE

1kHz OSC

PINK NOISE

Disable

TO TB

min max

OSC/NOISE

TRIM

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 55 56

Comments to this Manuals

No comments

Allenheath ML4000 USER GUIDE User Manual Page 45

Comments to this Manuals

Related products and manuals for Control panel Allenheath ML4000 USER GUIDE