®
AMV-7240 MKII
Automatic-Mixer/Amplifier
3
❶
❷
1. Basic settings of the amplifier (level/microphone input sensitivity)
•
Set the rotary knob VOLUME
❶
in the master section on the front panel to about line 4 from left. Pull out the
bridge jumper
J14, AUTO ON on the basic printed circuit board (PCB) – this disables the automatic mixing function.
•
Set the level of MIC/LINE 1 on the front panel
❷
to max and the other inputs (2 - 5) to min.
Adjust the microphone input sensitivity with the trimmer GAIN on the PCB, so that you obtain
maximum
sensitivity (gain) before acoustical feedback occurs. Under realistic speaker distance to the microphone, the limiter
light led should not light up.
Set the microphone equalizer HIGH, MID, LOW (trimmer on PCB) to the required sound under consideration
of the microphone sound characteristic and room acoustics. If necessary adjust the level to insure a safety
margin before the onset of feedback.
•
Repeat the settings mentioned before for all inputs with connected microphones.
•
The trimmer COMPR (on the mic input PCB) allows for adjusting the threshold for onset of signal compression.
•
The NOISEGATE trimmer may be adjusted for the desired threshold of the gate (gain reduction of 10 dB).
•
A subsonic filter (high pass) may be activated with the jumper SUBBASS (for example to improve
intelligibility of speech in a noisy surrounding).
•
The microphone inputs may also be used as line inputs. Deactivating of
automatic mixing
and
compression
is done by depressing AUTO OFF for the corresponding input on the front panel.
The AMV7240 MKII features a removable metal plate on
its top - secured by six small metal screws. Parameters
of Mic/Line inputs (gain, 3-band eq, compression,
noise gate) are adjustable via the supplied adjustment
screwdriver.
Even inside a 19“ rack already, the AMV7240 MKII may
be pulled to front by approx. 10 cm and all these para-
meters can be adjusted or re-adjusted.
Only authorized persons may remove the top metal plate.
