Shure BLX14/SM31 Wireless Fitness Headset System - H11 Band

Cut through the Noise with the Shure BLX14/SM31 Wireless Fitness Headset System - H11 Band

The BLX14/SM31 Headworn Wireless System is part of the BLX wireless systems family. Shure BLX Wireless Systems combine professional-quality sound with simple setup and an intuitive interface for legendary audio performance right out of the box. Precision-built and available in a variety of configurations, it's the most accessible way to own the stage. Includes BLX4 wireless receiver, BLX1 bodypack transmitter, SM31 fitness headset microphone, power supply, clothing clip, windscreens, and user guide.

The rugged and durable SM31FH is a cardioid condenser microphone constructed with hydrophobic materials that make it ideal for true performance in fitness instruction applications. The moisture-repellent cartridge housing ensures a long product life by protecting the microphone from the corrosion damage that causes typical fitness instruction headsets to fail.

BLX1 Bodypack

• Quick and easy receiver frequency matching
• TQG connection for use with Shure lavalier, headset, earset and instrument microphones and guitar cables
• Easily accessible On/Off switch

BLX4 Single Channel Receiver

• XLR and 1/4-inch output connectors
• Two-color audio status indicator LED
• Green: Normal audio levels
• Red: Excessive audio levels (overload/clipping)

SM13FH Fitness Condenser Microphone

• Wireframe headset fits securely and comfortably for fitness and aerobics instructors
• Moisture-repellent hydrophobic fabric protects the microphone cartridge from harmful corrosion that occurs in humid environments
• Flexible gooseneck provides discrete adjustment capabilities to optimize placement for greatest isolation
• Lightweight and low-profile design won't fatigue instructors during high-impact use
• TA4F (TQG) connector is compatible with any Shure wireless bodypack
• Included windscreen tames plosive, breath, and wind noise for clean and intelligible sound
• Tailored frequency response ideal for crisp, clear vocal reproduction
• Available with bundled BLX and GLX-D wireless systems
• Legendary Shure precision engineering for durability and performance

SPECIFICATIONS

BLX1 Bodypack

• Gain Max: -16 dBV maximum
• Gain Min (0 dB): +10 dBV maximum
• Gain Adjustment Range: 26 dB
• Input Impedance: 1 M
• RF Transmitter Output: 10 mW, typical, varies by region
• Dimensions (H x W x D): 110 mm X 64 mm X 21 mm
• Weight: 75 g (2.6 oz.), without batteries
• Housing: Molded ABS
• Power Requirements: 2 LR6 AA batteries, 1.5 V, alkaline
• Battery Life: up to 14 hours (alkaline)

BLX4 Single Channel Receiver

• Output Impedance: XLR connector: 200 ohms, 6.35 mm (1/4") connector: 50 ohms
• Audio Output Level: Ref. ±33 kHz deviation with 1 kHz tone
• XLR connector: -27 dBV (into 100 ohms load)
• 6.35 mm (1/4") connector: -13 dBV (into 100 ohms load)
• RF Sensitivity: -105 dBm for 12 dB SINAD, typical
• Image Rejection: greater than 50 dB, typical
• Dimensions(H x W x D): 40 mm X 188 mm X 103 mm
• Weight: 241 g (8.5 oz.)
• Housing: Molded ABS
• Power Requirements: 12-15 V DC @ 160 mA (BLX88, 320 mA), supplied by external power supply (tip positive)

SM13FH Fitness Condenser Microphone

• Type: Electret Condenser
• Frequency Response: 45 to 20,000 Hz
• Polar Pattern: Unidirectional (Cardioid)
• Output Impedance @ 1 kHz: 600 ohms
• Audio Output: Level -50 dBV/Pa
• Signal-To-Noise Ratio @ 1 kHz: 66 dB
• Maximum SPL 1000 ohms load, @ 3% THD: 145.0 dB
• Dynamic Range @ 1 kHz, 1000 ohms load: 117.0 dB
• Equivalent Output Noise, Typical, A-Weighted: 28 dB
• Power Requirements: +5 V DC (nominal), 10 V maximum (DC bias)
• Polarity: Positive pressure on diaphragm produces positive voltage on pin 3 with respect to pin 1
• Cable: 1.1 m (45 in.)
• Connector: TA4F
• Net Weight: 60 g (2.11 oz.)

We are Musictoner Musictoner

Since 1958, Chuck Levin’s Musictoner has been the trusted destination for musicians and audio professionals across Maryland, Virginia, and Washington, D.C. Family-owned and operated, our legendary music store delivers Everything in Music®—from instruments and recording gear to pro audio, rentals, and repair services.

Our team of musicians and industry experts lives and breathes gear, helping you build the perfect setup for your next performance, studio session, or installation. As an authorized dealer for top brands, we also offer our award-winning CHUCKSCLUSIVE line—exclusive, limited-edition instruments and collaborations recognized with the NAMM Top 100 Dealer Innovation Award for redefining what a music retail experience can be.

Chuck Levin’s isn’t just a store—it’s a community built by players, engineers, and creators who share a lifelong passion for sound. Stop by our legendary Wheaton, MD showroom or contact us anytime for expert advice, product questions, or the best possible deal on your next piece of gear.