Shure SM31FH User Manual

Product Specifications

20

15

10

5

0

-30

-25

-20

-15

-10

-5

dB

Hz

20 100 1k 10k 20k

0.6 m (2 ft.) from sound source 1 cm (0.4 in) from sound source

SM31FH Fitness Headset Condenser Microphone

Overview

The new SM31FH adds hydrophobic materials to the industry-standard, road-tested Shure SM family in a rugged and durable cardioid condenser microphone.
TA4F 4-pin connectors make it a viable replacement for any existing Shure wireless headset system, and is also available with BLX and GLX-D wireless system
bundles. The moisture-repelling cartridge housing protects the microphone and ensures a long lifetime of use, all but eliminating the need to frequently replace
typical headsets.

Features

• Wearable wireframe headset with secure, comfortable fit made for fitness and aerobics instructors

• Integrated moisture-repelling hydrophobic fabric protects the microphone element from harmful corrosion for use in humid environments

• Flexible gooseneck design provides discrete adjustment options to optimize placement for greatest isolation

• Lightweight and low-profile form factors stave off fatigue during high-impact use

• Compatible with Shure wireless bodypack systems for direct replacement of TA4F-connected microphones

• Available with a wide variety of Shure wireless systems, renowned for their ease of use and reliable performance

• Included windscreen tames plosive, breath and wind noise for clean and intelligble sound

• Tailored frequency response refined for crisp and clear vocal reproduction

• Legendary Shure precision engineering for durability and performance

Available Models

SM31FH-TQG Fitness Headset Cardioid Condenser Microphone with Windscreen
BLX1288/SM31 BLX Dual-Channel Wireless Combo System
BLX14/SM31 BLX Wireless Headset System

BLX188/SM31 BLX Dual-Channel Wireless Headset System

GLXD14/SM31 GLX-D Digital Wireless Headset System

Specifications

Type Electret Condenser
Frequency Response 45 to 20,000 Hz
Polar Pattern Unidirectional (Cardioid)
Output Impedance

@ 1 kHz

Audio Output Level -50 dBV/Pa
Signal-To-Noise Ratio

@ 1 kHz

Maximum SPL

1000 Ω load, @ 3% THD

Dynamic Range

@ 1 kHz, 1000 Ω load

Equivalent Output Noise

Typical, A-Weighted

[1]

[1]

[1]

[1]

Power Requirements +5 V DC (nominal), 10 V maximum (DC bias)
Polarity Positive pressure on diaphragm produces positive voltage on pin 3 with respect to pin 1
Cable 1.1 m (45 in.)
Connector TA4F
Net Weight 60 g (2.11 oz.)

[1]

Measurements taken using RK100PK preamp set @ 0 dB using 8k bias resistor.

* All specifications measured with a 48 VDC phantom power supply. The microphone operates at lower voltages, but with slightly decreased headroom and sensitivity.

600 Ω

66 dB

145.0 dB

117.0 dB

28 dB

SM31FH

Optional Accessories

RK379 Replacement kit with clip + 2 foam windscreens

Polar Patterns

125 Hz
250 Hz
500 Hz

www.shure.com

1,000 Hz

5,000 Hz
10,000 Hz

Frequency Response

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