Shure BLX14/SM31 Fitness Headset Audio System – H9 Band (512–542 MHz) with SM31FH Headworn Mic, BLX4 Receiver & BLX1 Bodypack

Reliable wireless audio for active fitness spaces

The Shure BLX14/SM31 fitness headset system delivers dependable UHF wireless performance designed for instructors, trainers, and presenters who move through busy studios and gym floors. Operating in the H9 band (512–542 MHz), this setup aims to keep voice clear and consistent even as you cue workouts, transition between stations, or lead group coaching. The combination of a compact bodypack, a clip-on headset mic, and a simple receiver gives you a streamlined, mobile solution for dynamic environments.

Key advantages for fitness professionals

• Up to 300 ft (100 m) of line-of-sight range supports larger rooms and multi-area classes.
• Long runtime: the BLX1 bodypack delivers power for extended sessions using two AA batteries, typically around 14 hours.
• Moisture-resistant headset and windscreen help maintain clear voice capture during intense movements and sweats.
• Multi-channel flexibility: the system supports up to 12 compatible channels per band for multi-device setups in larger facilities.

What’s in the box and what you get

• BLX4 single-channel receiver
• BLX1 bodypack transmitter
• SM31FH fitness headset microphone with windscreen and clothing clip
• Power supply
• Two AA batteries
• User guide

Real-world use cases

In a bustling studio, instructors can move with confidence while delivering cueing, form checks, and pace guidance. The system’s stable wireless link helps minimize interruptions during transitions, and the lightweight headworn mic stays secure as you bend, twist, or raise arms. Outdoor or large‑area sessions benefit from windscreen protection and steady audio when the audience is spread across a space.

Setup tips and considerations

Before ordering, verify local spectrum regulations. Once paired with a compatible transmitter, assign channels strategically to reduce interference in multi‑system environments. The BLX14/SM31 kit is designed to pair smoothly with other Shure wireless devices, offering a straightforward path to scalable setups.