Shure MX400D Manuel D’Utilisation

Use these settings if connecting the microphone 

to an automatic mixer or other device that mutes 

audio and controls the LED.
1. Connect logic leads to the automatic mixer. 

Connect the LED IN to the gate output to illumi-

nate the LED when that channel is gated on.

2. Set DIP switch 3 on. This disbles the mute but-

ton (the microphone passes audio regardless of 

whether the button is pressed or not).

3. Set DIP switch 1 to configure how the mute but-

ton sends SWITCH OUT logic:

Green (LOGIC GROUND): Connects to the logic 

ground of an automatic mixer, switcher, or other 

equipment. 
Orange (LED IN): Set DIP switch 3 on to use LED 

IN. When shorted to LOGIC GROUND, the LED 

turns on.
White (SWITCH OUT): Provides TTL logic (0 Vdc 

or 5 Vdc) in response to the mute button. Set DIP 

switch 1 for momentary or toggle. When phantom 

power is applied, logic initializes high (5 Vdc). DIP 

switch 2 has no effect on SWITCH OUT.

Use the DIP switches to configure logic settings 

and mute button behavior. 
The DIP switches are covered with a piece of 

clear tape at the factory. Remove tape to modify 

the switch settings.

1 Momentary

Toggle

2 Push-to-mute

Push-to-talk

3 Mute button enabled, 

LED illuminates when 

mic is active

Disable mute button 

(microphone always 

on), logic controls 

LED

4 --

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Use the following modification in situations where 

your logic interface requires momentary closure of 

the SWITCH OUT, but you want the mute button 

to toggle the microphone (DIP switch 1 ON, 3 

OFF):
1. Access the circuit board in-

side the microphone base.

2. Remove the resistor at R45 

and reinstall it at location 

R46.

Use DIP switches 1 and 2 to configure the mute 

button, as follows.
Be sure to set DIP switch 3 off (factory default) 

so that the mute button controls audio from the 

microphone.

Momentary: push-to-mute 

(as shipped).

Momentary: push-to-talk

Toggle: (Push On/Push 

Off): Mic is active when 

powered on

Toggle: (Push On/Push 

Off): Mic is mute when 

powered on

NOTE: Audio and logic ground are connected at 

microphone base.

Ground (Green)

SWITCH OUT (White)

LED IN (Orange)

Audio + (Red)

Audio – (Black)

NOTE: Bottom 

cover must 

be closed for 

microphone to 

function.

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