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Shure BLX14/SM31 Fitness Headset Wireless Microphone System

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Product Description

The BLX Wireless Fitness Headset System from Shure joins world-class design and construction with simple and easy setup and operation, featuring QuickScan frequency selection and the ultra-durable, moisture-resistant SM31FH Fitness Headset Condenser microphone ideal for fitness and aerobics instructors. Legendary sound and performance, right out of the box.


The new SM31FH adds hydrophobic materials to the industry-standard, road-tested Shure SM family in a rugged and durable cardioid condenser microphone. 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.

Shure BLX14/SM31 Fitness Headset Wireless Mic Features

  • SM31FH Fitness Headset Mic:
    • 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
    • Included windscreen tames plosive, breath and wind noise for clean and intelligible sound
    • Tailored frequency response refined for crisp and clear vocal reproduction
    • Legendary Shure precision engineering for durability and performance
  • BLX1 Bodypack Transmitter:
    • Up to 14 hours of continuous use (2AA batteries)
    • Up to 300 feet (100m) transmission radius (line of sight)
    • Quick and easy frequency matching (GROUP and CHANNEL selection buttons)
    • TQG connection for use with Shure lavalier, headset, earset and instrument microphones and guitar cables
    • Tactile on/off switch
    • Adjustable gain control
    • Lightweight, rugged construction
  • BLX4 Wireless Receiver:
    • One-touch QuickScan frequency selection quickly locates the best open frequency (in case of interference)
    • Up to 12 compatible systems per frequency band
    • XLR and 1/4 inch output connectors

Product Specifications
Shure BLX14/SM31 Fitness Headset Wireless Mic Specifications
  • Working Range: 91 m (300 ft) Line of Sight
  • Audio Frequency Response: 50 to 15,000 Hz Note: Dependent on microphone type
  • Total Harmonic Distortion: 0.5%, typical
  • Dynamic Range: 100 dB, A-weighted, typical
  • BLX1 Bodypack Transmitter:
    • Gain Adjustment Range: 26 dB
    • Input Impedance: 1 MO
    • RF Transmitter Output: 10 mW, typical varies by region
    • Housing: Molded ABS
    • Power Requirements: 2 LR6 AA batteries, 1.5 V, alkaline
    • Battery Life: up to 14 hours (alkaline)
    • Dimensions (HxWxD): 110 x 64 x 21 mm
    • Weight: 75 g (2.6 oz.), without batteries
  • SM31FH Fitness Headset Condenser Mic:
    • Type: Electret Condenser
    • Frequency Response: 45 to 20,000 Hz
    • Polar Pattern: Unidirectional (Cardioid)
    • Output Impedance: at 1 kHz 600 O
    • Audio Output Level: -50 dBV/Pa
    • Signal-To-Noise Ratio: at 1 kHz 66 dB
    • Maximum SPL: 1000 O load, at 3% THD 145.0 dB
    • Dynamic Range: at 1 kHz, 1000 O load 117.0 dB
    • Equivalent Output Noise: Typical, A-Weighted 28 dB
    • Power Requirements: +5 V DC (nominal), 10 V maximum (DC bias)
    • Cable: 1.1 m (45 in.)
    • Connector: TA4F
    • Net Weight: 60 g (2.11 oz.)
  • Included: BLX4 wireless receiver; BLX1 bodypack transmitter; SM31FH Fitness Headset Condenser Microphone with windscreen and cable clip
Helpful Info about the Manufacturer
Phone:  800-257-4873 Warranty:  2 Year Microphones; 1 Year Wireless Transmitters and Receivers
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