Shure BLX14/SM31 - BLX14 HEADSET SYSTEM W/SM31 Wireless System

Vendor: Shure
Shure BLX14/SM31 - BLX14 HEADSET SYSTEM W/SM31 Wireless System The Shure BLX14/SM31 has brought fitness and aerobics instructors, an affordable wireless headset microphone system with high-quality sound, easy setup, intuitive operation, and dependable & high...
$329.00 $411.00
Shure BLX14/SM31 - BLX14 HEADSET SYSTEM W/SM31 Wireless System

The Shure BLX14/SM31 has brought fitness and aerobics instructors, an affordable wireless headset microphone system with high-quality sound, easy setup, intuitive operation, and dependable & high performance right out of the box. BLX14/SM31 also includes the compact and lightweight BLX4 single-channel tabletop receiver with internal antennas which is perfect for portable use.

The BLX14/SM31 contains an SM31FH cardioid fitness headset mic along with windscreen and a bodypack transmitter. The headset is specifically designed to be comfortable and secure in place even during the most active workouts. Moisture-repellent hydrophobic fabric is protecting the microphone capsule from sweat and humidity.

The system features one-touch QuickScan frequency selection to quickly locate a clean frequency in case of interference. It provides up to 14 hours of continuous use with two AA batteries, at a range up to 300'. Up to 12 mic channels can operate simultaneously in each frequency band.

Durable Fitness Headset Mic Optimized for Speech

The rugged SM31FH fitness headset condenser microphone is built for comfort and clear vocal reproduction. It features a cardioid polar pattern that helps reject unwanted noise, and a tailored frequency response optimized for speech intelligibility. The lightweight design reduces fatigue during high-impact use, while the flexible gooseneck with discrete adjustment options lets you position the microphone for further source isolation in loud environments.

Lightweight Bodypack Transmitter

The durable BLX1 bodypack transmitter offers a lightweight, ergonomic design that is comfortable for the instructor to wear. Group and channel selection buttons allow for quick and simple frequency matching with the receiver. Other features include an easily accessible on/off switch, adjustable gain control, and a TA4M 4-pin input jack.

Easy-to-Use Tabletop Receiver for Quality Audio

The BLX4 receiver employs microprocessor-controlled internal antenna diversity to improve the quality and reliability of your wireless audio. An LED display shows group and channel settings, while two LED lights indicate when the system is ready for use and the strength of the incoming audio signal. The unit offers 1/4" and XLR outputs for connectivity to PA systems and mixing boards.

A Versatile System to Meet Your Needs

Shure offers a variety of lavalier, instrument, headset, and handheld microphone options to adapt your BLX system as your needs evolve.

  • The discrete MX153 sub-miniature earset mic provides exceptional clarity in spoken word applications.
  • The PGA31 is a comfortable headset microphone for lectures and presentations.
  • The CVL lavalier mic offers low visibility and clear vocal reproduction for discreet applications.
  • Instrumentalists can attach the WB98H/C flexible gooseneck instrument microphone for brass, woodwind, and percussion applications.
  • The WA302 guitar cable lets you connect the bodypack transmitter to a guitar or bass.
  • The BLX2 handheld transmitter is available with three different mic capsules for presenters who prefer the flexibility of a handheld microphone.

Shure BLX14/SM31 Specs Shure

Shure BLX14/SM31 Specs

  • Wireless Transmission: Analog UHF
  • Included Transmitters: 1 x Bodypack
     1 x Handheld
  • Diversity: Antenna Diversity
  • RF Frequency Band:  J10: 584 to 608 MHz
  • RF Bandwidth: 24 MHz
  • Frequency Step Size: 25 kHz
  • Max Operating Range: 300' / 91.4 m (Line of Sight)
  • Max Systems per Setup: 12
  • Dynamic Range:>100 dBA


  • Form Factor: Table-Top
  • Antenna: 2 x Internal, Fixed
  • Number of Audio Channels: 1
  • Audio I/O: 1 x XLR 3-Pin Male Output
    1 x 1/4" TRS Female Output
  • Audio Output Level: XLR Output:
    -27 dBV (Mic Level)
    1/4" Output:
    -13 dBV (Instrument Level)
  • Frequency Response: 50 Hz to 15 kHz (Dependent on Mic)
  • Impedance: XLR Outputs:
    200 Ohms
    1/4" Outputs:
     50 Ohms
  • Approximate RF Sensitivity: -105 dBm
  • Power Requirements: AC/DC Power Adapter
  • AC/DC Power Adapter: 12 to 15 VDC at 160 mA, Center-Positive (Included)
  • Display & Indicators: 1 x Multi-Segment LED (Channel, Group)
    2 x LED (AF Level, Sync)
  • Housing: ABS
  • Operating Temperature: : 0 to 135°F / -17 to 57°C
  • Dimensions: 7.4 x 1.6 x 4.1" / 188.0 x 40.0 x 103.0 mm
  • Weight: 8.5 oz / 241.0 g


  • Form Factor : Bodypack
  • RF Output Power: 10 mW
  • Audio I/O : 1 x TA4/Mini XLR 4-Pin Male Input (Lockable)
  • Muting: Off/On Switch
  • Gain Range : -16 to +10 dB
  • Sync Method : Manual
  • Antenna : 1 x Flexible Whip, Fixed (Beltpack)
  • Power Requirements : Battery
  • Battery Type : 2 x AA (Included)
  • Approx. Battery Life: 14 Hours (Alkaline)
  • Display & Indicators: 1 x Multi-Segment LED (Channel, Group)
    1 x LED (Battery Status, Power)
  • Housing: ABS
  • Dimensions : 2.5 x 4.3 x 0.8" / 64.0 x 110.0 x 21.0 mm
  • Weight : 2.6 oz / 75.0 g (without Batteries)


  • Form Factor: Headworn
  • Sound Field: Mono
  • Transducer: Electret Condenser
  • Polar Pattern: Cardioid
  • Frequency Range: 45 Hz to 20 kHz
  • SNR: 66 dB 
  • Equivalent Noise Level: 28 dB 
  • Maximum SPL: 145 dB SPL
  • Impedance: 600 Ohms
  • Dynamic Range : 117 dB
  • Output Connectors: 1 x TA4/Mini XLR 4-Pin Female (Lockable)
  • Cable Length: 3.61' / 1.1 m
  • Operating Voltage: 5 V
  • Weight: 2.12 oz / 60 g

Packaging Info

  • Form Factor: 2.83 lb
  • Box Dimensions (LxWxH): 13.5 x 11.95 x 4.0"