Axxent AMV-7240 MKII Operating Manual - Page 4

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2. Setting/adjusting automatic mixing

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After finishing input gain adjustment, please again insert the Jumper J14 for automatic mix function. Now only

the microphone with a direct input signal should switch on automatically (green LED ACTIVE). If more than the just

used microphone is active, please reduce slightly gain of the other microphones until you reach a proper treshold of

the gate. This should be repeated with each microphone. Lost input gain can be leveled by the master gain control.

3. Setting/adjusting volume

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In normal operation the MIC/LINE potentiometers are set to maximum. Unused inputs are set to minimum.

For these inputs the AUTO OFF switch should be activated in order not to influence automatic mixing. The overall

volume is set with the rotary potentiometer VOLUME. Carefully observe onset of acoustical feedback.

In venues with high sound reflections (poorly damped) start with a setting of the knob to position 4. In instal-

lations with improved (higher damped) acoustical conditions the total useable volume may be increased –

but again: watch the danger of acoustical feedback.

4. AUX settings

Choose the input signal AUX 1 or AUX 2 by depressing the equivalent push button on the front panel (section AUX

CONTROL). The trimmers GAIN AUX lets you set the sensitivity so, that no limiting of the signal occurs (VOLUME 4),

verified by the LIMIT LED in the master section. Set the desired volume with the rotary knob VOLUME (on the front

panel in the section AUX CONTROL). The sound (tonal characteristics) can be set and optimised by the potentio-

meters LOW and High accordingly.

5. Ducking (automatic signal attenuation)

Connect the signal to the AUX input and set the trimmer DUCK AMPL to centre position. Now test this function by

speaking into the microphone at the MIC/LINE input. The DUCK GATE threshold may be adjusted at the same named

Trimmer, so that the AUX signal is attenuated to your preference. In its factory setting, a certain amount of ducking will

be noted. For church installations, we recommend to turn off the duck gate completely: just turn the potentiometer

complete clockwise.

6. Parametric equalizer

Factory setting of the parametric eq is OFF via Jumper J12. If you wish the equalizer, please reset the jumper to EQ

ON. The parametric equalizer is helpful for solving problems in venues with difficult acoustic environment and to

simultaniously optimise speech for maximum intelligibility. Feedback prone frequencies lowering the threshold for

onset of feedback are filtered out of the audio spectrum (reflected signals are time delayed). The EQ is simply acti

vated by EQ ON. The built in equalizer covers the total audio spectrum. For ease of use the EQ is split into 4 overlap

ping sections: F1 = 20...9 00 Hz, F2 = 65...3 000 Hz, F3 = 170...7 000 Hz and F4 = 450...20 000 Hz. The (critical) fre

quency is selected by the trimmer FREQ, the bandwidth Q = 1...12 with the trimmer BAND and the amplitude range

with the trimmer GAIN. The sections are overlapping in order to filter out a relative small and steep frequency range

(notch-filter).

7. Amplifier output level

When setting up the system in venues with high acoustical damping factor, where high output power can be utilized,

set the rotary pot VOLUME in the MASTER area on the front panel so, that no permanent limiting of the output signal

occur (watch the LIMIT LED, which also can indicate amplifier overload).

AMV-7240 MKII

Automatic-Mixer/Amplifier