Shure manual Microphone Specifications, Preamplifier Specifications MX391 and MX391 only

MICROPHONE SPECIFICATIONS

Polar Pattern (Figure 6)

Cardioid (MX391/C, MX391W/C)

Supercardioid (MX391/S, MX391W/S)

Omnidirectional (MX391/O, MX391W/O)

Environmental Requirements

Operating Temperature Range: -18°C to 57° C (0° F to 135° F)

Relative Humidity: 0 to 95%

Dimensions

See Figure 3.

Wiring Diagram

	SHIELD =
	Connector housing
3	PINS 3 and 4= BLACK
1	LEAD (jumped)

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2 PIN 2 = RED LEAD

FIGURE 2

PREAMPLIFIER SPECIFICATIONS:

MX391 AND MX391 ONLY

These specifications apply only to the MX391/MX391W microphones when used with the supplied preamplifier. All measurements taken with the microphone mounted on a 76.2 cm x 76.2 cm (30 in. x 30 in.) wood- en surface and with the sound source incident at 30° with respect to the surface plane.

Frequency Response (Figure 5)

50 to 17,000 Hz

Output Impedance (at 1000 Hz)

180Ω actual (rated at 150Ω)

Open Circuit Sensitivity

Cartridge Type	1 kHz ref. 1 V per Pascal *
Cardioid	-29.6 dB (33.5 mV)
Supercardioid	-28.3 dB (38.5 mV)
Omnidirectional	-21.5 dB (81.4 mV)

All settings -12 dB at 0 gain *1 Pascal = 94 dB SPL

Maximum Sound Pressure Level

(1 kHz at 1% Total Harmonic Distortion, 1 kΩ load)

Cardioid: 118.8 dB

Supercardioid: 117.5 dB

Omnidirectional: 110.7 dB

All settings +6 dB at 0 gain

Signal to Noise Ratio (referenced at 94 dB SPL)

Cardioid: 71.4 dB

Supercardioid: 72.7 dB

Omnidirectional: 79.5 dB

Equivalent Output Noise (A-weighted)

Cardioid: 22.6 dB SPL

Supercardioid: 21.3 dB SPL

Omnidirectional: 14.5 dB SPL

Dynamic Range at 1 kΩ Load

96.2 dB

100 dB at 0 gain

Common Mode Rejection

45 dB minimum, 10 Hz to 100 kHz

Preamplifier Output Clipping Level

-6 dBV (0.5 V)

-12 dB at 0 gain

Polarity

Positive sound pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of the preamplifier XLR output connector.

Power Requirements

11 to 52 Vdc phantom

2.0mA current consumption

Certification

Eligible to bear CE Marking. Conforms to European EMC Directive 89/ 336/EEC. Meets applicable tests and performance criteria in European Standard EN55103 (1996) parts 1 and 2, for residential (E1) and light industrial (E2) environments.

FURNISHED ACCESSORIES

Zipper Bag	95A2313
In-Line Preamp (MX391 & MX391W)	RK100PK
Hex Wrench #4 (MX391 & MX391 W)	80A67

REPLACEMENT PARTS

Omnidirectional Cartridge	R183B
Supercardioid Cartridge	R184B
Cardioid Cartridge	R185B
In-Line Preamplifier (black)	RK100PK
In-Line Preamplifier (white)	RK100PKW

NOTE: For technical data by Fax, phone 1-800-516-2525 and follow the recorded instructions. For additional technical assistance, phone Shure at (847) 600-2000. In Europe, phone 49-7131-72140.

SHURE, the Shure logo, and MICROFLEX are registered trademarks of Shure Incorporated.

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