Audio Technica SmartMixer AT-MX341a, Installation And Operation Manual

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Adjusting ”Off” Attenuation
In instances when the number of microphones in use is high, it may be necessary to increase
the amount of “off ” attenuation per microphone to keep the total ambient noise level low.
There are “off ” attenuation adjustments inside the unit. To adjust the “off ” attenuation of
channel 1, unplug the unit, remove the top cover and locate the trimpot designated on the
circuit board by “VR5” (Figs. 3 and 4). It is factory set at approximately 8 dB, the attenuation
at the middle of the control’s rotation. When the control is turned fully counter-clockwise,
“off ” attenuation is approximately 20 dB. Conversely, when the adjustment is turned fully
clockwise, “off ” attenuation is approximately 6 dB. VR6, VR7 and VR8 control “off ” attenuation
for channels 2, 3 and 4 respectively.
Figure 3. Internal view of mixer.
Figure 4. Detail of internal controls.
Front Panel
Rear Panel Output Level LED Meter
The Output Level LED meter is factory set
to indicate RMS output. Should peak output
indication be desired, simply unplug the unit,
remove the top cover and change the setting
of the switch designated on the circuit board
by “SW16” (Figs. 3 and 4). “Zero” (0) level is
factory-calibrated at +4 dBm into 600 ohms.
8
Mic
Line
Phantom
Off
Mic
Line
Phantom
Off
Mic
Line
Phantom
Off
SW7
Mic
Line
Phantom
Off
SW4 SW8
Line
Mic
Output
–10 dB 0 dB –10 dB 0 dB –10 dB 0 dB –10 dB 0 dB
SW16
Peak RMS
SW3 SW6 SW6 SW2 SW5 SW1
SW9 SW10 SW11 SW12
VR5 VR6 VR7 VR8
SW15
Meter Pad Pad Pad Pad
–20 dB –6 dB –20 dB –6 dB –20 dB –6 dB –20 dB –6 dB