Description
The Shure BLX14/SM31 Wireless Fitness Headset System is a dependable wireless solution designed for fitness instructors and active presenters, delivering clear, professional-quality vocal sound with simple setup and intuitive operation. It includes the sweat-resistant SM31FH cardioid headset microphone, engineered to stay secure during high-movement activities while rejecting unwanted background noise. The lightweight BLX1 bodypack transmitter ensures comfortable wear, while the compact BLX4 tabletop receiver offers reliable signal stability with one-touch QuickScan frequency selection. With a range of up to 300 ft (100 m), up to 14 hours of battery life, and support for up to 12 simultaneous systems per frequency band, it is ideal for gyms, studios, and live instruction environments where reliability and clarity are essential.


Reliable Wireless System
Featuring one-touch QuickScan frequency selection, up to 14 hours of battery life, a 300 ft (100 m) operating range, and support for up to 12 systems per frequency band, the BLX system delivers dependable wireless audio with fast, intuitive operation.


Sweat-Resistant Headset
The included SM31FH cardioid headset microphone is designed for high-movement fitness use, staying securely in place while resisting sweat and humidity, with a tailored frequency response for clear and intelligible speech even in loud environments.
Includes a moisture-resistant SM31FH cardioid fitness headset microphone designed for secure fit and comfort during high-movement use.
Delivers up to 14 hours of continuous operation using two AA batteries.
One-touch QuickScan frequency selection quickly finds a clean RF channel to minimise interference.
Provides a wireless operating range of up to 300 ft (100 m) for full freedom of movement.
Supports up to 12 compatible wireless systems per frequency band (region dependent).
BLX4 tabletop receiver features internal antenna diversity with XLR and ¼″ outputs for flexible system integration.
Lightweight BLX1 bodypack transmitter offers ergonomic wear, easy frequency matching, and adjustable gain control.
Wireless Technology: Analog UHF
Diversity: Yes
RF Frequency Band: H8E: 518 to 542 MHz
Number of RF Channel Frequencies: 123
Max Operating Range: 300′ / 91.4 m (Line of Sight)
Max Transmitters per Band: 12
Dynamic Range: 100 dBA
Receiver Type: 1x Tabletop
Antenna: 2x Internal
Number of Audio Channels: 1
Audio I/O:
1x XLR 3-Pin Balanced Output
1x 1/4″ TS Unbalanced Output
Frequency Response: 50 Hz to 15 kHz (Dependent on Mic)
Display: Alphanumeric LED
Power Requirements: AC/DC Power Adapter
Included Transmitters: 1x Bodypack
RF Output Power: 10 mW
Antenna: Fixed Flexible Whip
Input Level: Microphone
Audio I/O: 1x TA4M/Mini-XLR 4-Pin Male Input
Bias/Plug-In & Phantom Power:
5 V Bias/Plug-In Power
No Phantom Support
Muting: Off/On Switch
Gain Range: -16 to +10 dB
Sync Method: Manual
Display: Alphanumeric LED (In Battery Compartment)
Microphone Type: 1x Headset
Polar Pattern: Cardioid
Frequency Response: 45 Hz to 20 kHz
Maximum SPL: 145 dB
Output Connector: 1x TA4F/Mini-XLR 4-Pin Female
Cable Length: 3.61′ / 1.1 m
Color: Black
Transmitter Battery Type: 2x AA (Included)
Transmitter Battery Life: 14 Hours (Alkaline)
Included Charging Case: No
AC/DC Power Adapter: 12 to 15 VDC at 160 mA, Center-Positive (Included)
Input Power: 100 to 240 VAC, 60 / 50 Hz at 150 mA
Environmental Resistance: Water-Resistant (Unrated)
Housing: ABS
Dimensions:
Receiver: 7.4 x 1.6 x 4.1″ / 188 x 40 x 103 mm
Transmitter: 2.5 x 4.3 x 0.8″ / 64 x 110 x 21 mm
Weight:
Receiver: 8.5 oz / 241 g
Transmitter: 2.6 oz / 75 g (without Batteries)
Microphone: 2.1 oz / 60 g


















