Output Level; Phantom Power; Output Level Led Meter - Audio Technica AT-MX351 Installation And Operation Manual

The preamplifier gain may be reduced further, allowing the SmartMixer to accept line-level
sources. Changing the settings of the internal switches designated by "SW3," "SW9," "SW15"
and "SW21" will cause an input reduction of 50 dB for channels 1, 2, 3 and 4 respectively.
Note that the appropriate internal switches can be used in combination for a total sensitivity
reduction of up to 60 dB for each channel.

Output Level

The SmartMixer's output is factory set at line level. Should mic-level output be desired,
simply unplug the unit, remove the top cover and locate the switch on the circuit board
marked "SW26" (Figs. 4 and 5, page 11). Changing the setting of this switch will cause a
50 dB reduction in output.

Phantom Power

Each of the SmartMixer's inputs supplies +48V DC phantom power. Should it be required
to disable the phantom power, simply unplug the unit, remove the top cover and locate the
switches designated on the circuit board by "SW1," "SW7," "SW13" and "SW19" (Figs. 4 and 5,
page 11). Changing the settings of these switches will disable phantom power on channels 1,
2, 3 and 4, respectively. Note that, although they do not require phantom power for operation,
most balanced-output dynamic microphones can be used without disabling the SmartMixer's
phantom power.

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 "SW27" (Figs. 4 and 5, page 11). "Zero" (0) level
is factory-calibrated at +4 dBm into 600 ohms.
Function
48V Phantom Power
10 dB Input Atten.
50 dB Mic /Line Atten.
Limiters (on/off)
"Off " Atten. Range
Preamp Output Gating
Limiter Thresholds
"Off " Atten. Adjustment
NOMA
Meter RMS/Peak
Figure 3. Summary of internal controls
Summary of Internal Controls
Ch 1 Ch 2
SW1 SW7
SW2 SW8
SW3 SW9
SW4 SW10
SW5 SW11
SW6 SW12
VR2 VR5
VR3 VR6
-- --
-- --
Ch 3 Ch 4 Output
SW13 SW19
SW14 SW20
SW15 SW21 SW26
SW16 SW22
SW17 SW23
SW18 SW24
VR8 VR11
VR9 VR12
-- -- SW25
-- -- SW27
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