Shure BLX14/SM31 Wireless Headset System




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.

The BLX14/SM31 Wireless Headset System includes BLX4 wireless receiver, BLX1 bodypack transmitter, SM31 fitness headset microphone, power supply, clothing clip, windscreens, and user guide.

The SM31FH cardioid condenser microphone with analogue transmission features moisture-repelling construction for true performance in humid applications where corrosion damage is common.

Included Accessories:
1 – PS24 Power Supply
1 – Clothing clip
1 – Windscreen
1 – Carrying Case


Working Range: 91 m (300 ft) Line of Sight
Audio Frequency Response: 50 to 15,000 Hz*
Total Harmonic Distortion: Ref. +/-33 kHz deviation with 1 kHz tone; 0.5%, typical
Dynamic Range: 100 dB, A-weighted, typical
*Note: Dependent on microphone type

Audio Input LeveL (mind/max): -16 dBV to +10 dBV(0 dB)
Gain Adjustment Range: 26 dB
Input Impedance: 1 MΩ
RF Transmitter Output: 10 mW, typical
Dimensions (H x W x D): 4.33 in. x 2.52 in. x 0.83 in. (110 mm x 64 mm x 21 mm)
Weight: 2.6 oz. (75 g), without batteries
Housing: Molded ABS
Power Requirements: 2 LR6 AA batteries, 1.5 V, alkaline
Battery Life: up to 14 hours (alkaline)
Audio Input Level
(0dB) -20 dBV maximum
(-10dB)-10 dBV maximum
Gain Adjustment Range: 10 dB
RF Transmitter Output: 10 mW, typical
Dimensions: 8.82 in. x 2.09 in. (224 mm x 53 mm) L x Dia.
Weight: 7.7 oz. (218 g) without batteries
Housing: Molded ABS
Power Requirements: 2 LR6 AA batteries, 1.5 V, alkaline
Battery Life: up to 14 hours (alkaline)

Output Impedance
XLR connector: 200 Ω
6.35 mm (1/4″) connector: 50 Ω
Audio Output Level: Ref. 33 kHz deviation with 1 kHz tone
XLR connector: 27 dBV (into 100 kΩ load)
6.35 mm (1/4″) connector: 13 dBV (into 100 kΩ load)
RF Sensitivity: -105 dBm for 12 dB SINAD, typical
Image Rejection: > 50 dB, typical
Dimensions (H x W x D): 1.57 in. x 7.40 in. x 4.06in. (40 mm x 188 mm x 103 mm)
Weight: 48.5 oz. (241 g)
Housing: Molded ABS
Power Requirements: 1215 V DC @ 160 mA, supplied by external power supply (tip positive)



You can trust us

We’re a company of engineers. But we’re also performers, artists, presenters, concertgoers, and sometimes yeah, fans. We know the excitement before going on stage, starting a critical conference call, or listening to your favorite music. We understand what you’re going through, and what you need.

We got you. Partners, products, passion. We’re right there by your side in every moment that matters - large and small.

Our products are designed to outlast and outperform the competition. They’re not created to just be ok. They’re built to be the very best. With whatever stage you’re about to step onto—be it conference room or concert hall—we empower you with the proven audio engineering you need to experience and make extraordinary happen. As a Company and as individuals, we are ethical, honest, and fair in dealing with Associates, customers, and suppliers. We manufacture products of unmatched quality, reliability, and durability. Shure Associates show respect for one another in all circumstances. Shure is a good corporate citizen, neighbor, and employer. Whether you’re a musician, audio engineer, podcaster, lecturer, broadcaster, IT manager, sound contractor, YouTuber, or simply a music lover, Shure has an innovative audio product to exceed your expectations. From microphones to headphones to conferencing gear, we make products that help you define your sound. We take equipment issues out of the audio equation, so you can concentrate on your message or performance with confidence.


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