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Shure BLX14/SM31 Wireless Cardioid Fitness Headset Microphone System (J11: 596 to 616 MHz)

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Key Features
  • For Fitness Instructors
  • SM31FH Cardioid Fitness Headset Mic
  • Moisture-Repellent Mic Construction
  • Lightweight Bodypack Transmitter

Shure BLX14/SM31 Overview

The Shure BLX14/SM31 brings fitness and aerobics instructors a cost-effective wireless headset microphone system with quality sound, simple setup, intuitive operation, and dependable performance right out of the box. It includes the compact and lightweight BLX4 single-channel tabletop receiver with internal antennas, ideal for portable use.

The BLX14/SM31 also includes an SM31FH cardioid fitness headset mic with windscreen and a bodypack transmitter. The headset is specifically designed to stay comfortable and securely in place, even during the most active workouts. Moisture-repellent hydrophobic fabric helps protect the microphone capsule from sweat and humidity.

The receiver features one-touch QuickScan frequency selection to quickly search 123 available frequencies and locate a clean RF channel in case of interference. The system 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.
SKU: BLX14/SM31-J11 Category: Tag:

Shure BLX14/SM31 Specs

System
Wireless Transmission Analog UHF
Number of RF Channels 123
Included Transmitters 1 x Bodypack
Diversity Antenna Diversity
RF Frequency Band J11:
596 to 608 MHz
614 to 616 MHz
RF Bandwidth 14 MHz
RF Channel Scanning Auto-Scan
Max Operating Range 300′ / 91.4 m (Line of Sight)
Max Systems per Setup 12
Dynamic Range 100 dBA
Receiver
Form Factor Tabletop
Antenna 2 x Internal, Fixed
Number of Audio Channels 1
Audio I/O 1 x XLR 3-Pin Male Balanced Output
1 x 1/4″ TS Female Unbalanced 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 Output:
200 Ohms
1/4″ Output:
50 Ohms
Power Requirements AC/DC Power Adapter
AC/DC Power Adapter 12 to 15 VDC at 160 mA, Center-Positive (Included)
AC Input Power 100 to 240 VAC, 50 / 60 Hz at 150 mA
Display & Indicators 1 x Multi-Segment LED (Channel, Group)
2 x LED (AF Level, Sync)
Housing ABS
Dimensions 7.4 x 1.6 x 4.1″ / 188 x 40 x 103 mm
Weight 8.5 oz / 241 g
Transmitter 1
Transmitter
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
Auto-Level Control No
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 x 110 x 21 mm
Weight 2.6 oz / 75 g (without Batteries)
Microphone
Form Factor Headset
Sound Field Mono
Capsule Electret Condenser
Polar Pattern Cardioid
Frequency Range 45 Hz to 20 kHz
SNR 66 dB
Maximum SPL 145 dB SPL
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
General
Packaging Info
Package Weight 2.83 lb
Box Dimensions (LxWxH) 13.6 x 11.8 x 4.1″

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