Operation, cont’d
MAV 44 / 48 / 84 / 88 Matrix Switchers • Operation3-20
The input audio gain or attenuation can be adjusted from the front panel or by
using Extron’s Windows-based control program.
1. Apply audio signals to all inputs to be adjusted.
2. Press and hold the Audio Setup (I/O) button until the Audio Setup LED
lights. Release the Audio Setup button.
3. Press and release an input button to select an input. The selected input can be
adjusted and is tied to output 1 for measurement or monitoring.
a. The Output 1 through Output 3 LEDs display the approximate audio
gain or attenuation for the selected input. The +dB and –dB LEDs
display the polarity (+ [gain] or – [attenuation]).
• Each Output 1 through Output 3 LED indicates a range of 6 dB
when lit:
°Output 1 LED off = 0 dB to 5 dB
°Output 1 LED lit = 6 dB to 11 dB
°Output 1 and 2 LED lit = 12 dB to 17 dB
°Output 1 through Output 3 LEDs lit = 18 dB
• The +dB LED on indicates a positive (gain) level. The –dB LED on
indicates a negative (attenuation) level. Both LEDs on indicate 0 dB.
By noting these LEDs’ displays and counting the number of 1 dB steps
that you increase or decrease the audio level (step 4 and example 8, step 2a),
you can determine the exact input gain or attenuation setting.
b. The Power LED blinks to indicate the adjusted audio level (compared to
the internal level, -10 dBV):
• When the LED is lit most of the time, blinking off only occasionally,
the level is too high.
• When the LED is off most of the time, blinking on (lit) only
occasionally, the level is too low.
• When the LED blinks frequently, the level is in the proper range.
c. The LED lights steadily when the adjustment is at the minimum level
(maximum attenuation, -18 dB). The LED lights steadily when the
adjustment is at the maximum gain (+10 dB).
4. Press and release the and buttons to increase and decrease the audio
level by 1 dB or press and hold the buttons to increase or decrease the level by
3 dB per second. The or LEDs flash to indicate each 1 dB level change.
Each time you press the or button, wait for the or LED to flash
before pushing the button again. Pressing the button too rapidly may not
increment or decrement the audio level.
5. Press and release the Audio Setup button to save the level value in memory
and to exit Audio Setup mode. The Audio Setup LED turns off.
• After approximately 30 seconds of front panel inactivity, the switcher
saves the most recent input gain or attenuation levels and exits Audio
Setup mode.
• There is one audio gain or attenuation setting per input. The setting is
shared by the left and right audio inputs.
• The input audio gain or attenuation settings are stored in non-volatile
memory. When power is removed and restored, the audio level settings
are retained.