Shure MX400D User Manual
Page 2
2
Changing SWITCH OUT Terminal to Momentary,
Independent of S1 position. (Figure 6 on page 12)
To accommodate interface equipment requiring momentary clo-
sure of the microphone (even when the desired microphone func-
tion is latching on/off), proceed as follows:
1. Remove R45 from the top of the circuit board.
2.
Reinstall R45 at location R46 on the top of the circuit
board.
Custom Switch Modifications
S4 is available for custom logic modifications. When S4 is in the
ON position, pad W4 is connected to pad W5.
SHURE, the Shure logo, and MICROFLEX are registered trade-
marks of Shure Incorporated.
SPECIFICATIONS
Frequency Response (Figure 3 on page 11)
50 to 17,000 Hz
Polar Pattern (Figure 4 on page 11)
Output Impedance (at 1,000 Hz)
Rated at 150 Ω (180 Ω actual)
Open Circuit Sensitivity
At 1 kHz, ref. 1 V per Pascal*
Cardioid:-33.5 dBV (21.1 mV)
Supercardioid:-32.5 dBV (23.7 mV)
Omnidirectional:-28.0 dBV (39.8 mV)
* 1 Pascal=94 dB SPL
Maximum SPL (1kHz at 1% THD, 1 kΩ load)
Cardioid:123.0 dB
Supercardioid:122.0 dB
Omnidirectional:117.5 dB
Equivalent Output Noise (A-weighted)
Cardioid:29.0 dB SPL
Supercardioid:28.0 dB SPL
Omnidirectional:70.5 dB SPL
Signal to Noise Ratio (referenced at 94 dB SPL)
Cardioid:65.0 dB
Supercardioid:66.0 dB
Omnidirectional:70.5 dB
Dynamic Range with 1 kΩ load
94.0 dB
Common Mode Rejection
45.0 dB minimum
Mute Switch Attenuation
50.0 dB minimum
Preamplifier Output Clipping Level (1% THD)
-6.0 dBV (0.5 V)
Polarity
Positive sound pressure on diaphragm produces positive voltage
on pin 2 relative to pin 3 of XLR output connector.
Power Requirements
11 to 52 Vdc phantom, 2.0 mA
Environmental Requirements
Operating Temperature Range: -18° to 57° C (0° to 135° F)
Relative Humidity: 0 to 95%
Dimensions (Figure 5 on page 12)
Weight
MX412D: 0.81 kg (1.80 lbs.) net, 1.63 kg (3.62 lbs.) packaged
MX418D: 0.82 kg (1.82 lbs.) net, 1.64 kg (3.64 lbs.) packaged
Cable Type (Figure 7 on page 12)
The attached custom cable contains a shielded audio pair and
three unshielded conductors for logic control.
Overall diameter=0.6 mm (0.165 in.)
CERTIFICATION
Eligible to bear CE Marking. Conforms to European EMC Direc-
tive 89/336/EEC. Meets applicable tests and performance criteria
in European Standard EN55103 (1996) parts 1 and 2, for residen-
tial (E1) and light industrial (E2) environments.
FURNISHED ACCESSORIES
Snap-Fit Foam Windscreen
(1 furnished, 4 in replacement kit) .............................RK412WS
OPTIONAL ACCESSORIES
Foam Ball Windscreen................................................... A99WS
Locking Metal Windscreen........................................ A412MWS
Custom Logic Cable (specify length) ............................. 15A525
Custom Logic Cable
with threaded adaptor, to male XLR ..................................C131
REPLACEMENT PARTS
Omnidirectional Cartridge ............................................... R183B
Supercardioid Cartridge.................................................. R184B
Cardioid Cartridge........................................................... R185B
DESIRED MICROPHONE FUNCTION
USER ACTION/LED DISPLAY
DIP SWITCH SETTINGS
Push to Mute (As Shipped)
Press and hold switch to temporarily mute
microphone; release switch to unmute
LED turns on when microphone is active
S1 = OFF
S2 = OFF
S3 = OFF
Push to Talk
Press and hold switch to activate microphone;
release switch to mute
LED turns on when microphone is active
S1 = OFF
S2 = ON
S3 = OFF
Push On/Push Off
Press switch to toggle microphone on or off
LED turns on when microphone is active
S1 = ON,
S2 = ON for muted initial state
S2 = OFF for active initial state
S3 = OFF
Switch Deactivated, Mic Always Active
No action, LED Always OFF
S3 = ON
Switch Deactivated, Mic Always Active
Short LED IN terminal to LOGIC GROUND terminal
LED Always ON
S3 = ON
Automatic Mixer Mode
If S1=OFF, SWITCH OUT signal will be momentarily
logic low when switch is pressed
If S1=ON, SWITCH OUT signal will be latching logic
low when switch is pressed
Connect SWITCH OUT signal to various logic inputs
of automatic mixer for custom functions
Connect mixer channel GATE OUT to microphone
LED IN. LED on microphone turns on when its
channel is gated on
S1 = ON or OFF
S3 = ON