Shure BLX14/SM31 Wireless System with SM31FH Fitness Headset Microphone

- Working Range: 91 m (300 ft) Line of Sight
- Audio Frequency Response: 50 to 15,000 Hz Note: Dependent on microphone type
- Total Harmonic Distortion: 0.5%, typical
- Dynamic Range: 100 dB, A-weighted, typical
- Operating Temperature: -18*C (0*F) to 57*C (135*

BLX1 Bodypack Transmitter Specifications:
- BLX1 Bodypack Transmitter Audio Input Level gain max: -16 dBV maximum
- BLX1 Bodypack Transmitter Audio Input Level gain min (0 dB) : +10 dBV maximum
- Gain Adjustment Range: 26 dB
- Input Impedance: 1 MO
- RF Transmitter Output: 10 mW, typical varies by region
- Dimensions: 110 x 64 x 21 mm (H x W x D)
- 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)

SM31FH Fitness Headset Condenser Microphone Specifications:
- Type: Electret Condenser
- Frequency Response: 45 to 20,000 Hz
- Polar Pattern: Unidirectional (Cardioid)
- Output Impedance: @ 1 kHz 600 O
- Audio Output Level: -50 dBV/Pa
- Signal-To-Noise Ratio: @ 1 kHz 66 dB
- Maximum SPL: 1000 O load, @ 3% THD 145.0 dB
- Dynamic Range: @ 1 kHz, 1000 O load 117.0 dB
- Equivalent Output Noise: Typical, A-Weighted 28 dB
- Power Requirements: +5 V DC (nominal), 10 V maximum (DC bias)
- Cable: 1.1 m (45 in.)
- Connector: TA4F
- Net Weight: 60 g (2.11 oz.)
- Included: BLX4 wireless receiver; BLX1 bodypack transmitter; SM31FH Fitness Headset Condenser Microphone with windscreen and cable clip
Dimensions and Weight in Packaging
Band H10 (542-572 MHz)
Shipping Weight: 2.5 lbs
Shipping Dimensions: 14 x 12 x 4 in
Manufacturer Part Number (MPN): BLX14/SM31-H10
Band J11 (596-616 MHz)
Shipping Weight: 2.75 lbs
Shipping Dimensions: 14 x 12 x 4 in
Manufacturer Part Number (MPN): BLX14/SM31-J11
Band H9 (512-542 MHz)
Shipping Weight: 3 lbs
Shipping Dimensions: 14 x 12 x 4 in
Manufacturer Part Number (MPN): BLX14/SM31-H9
Band H11 (572-596 MHz)
Shipping Weight: 2.75 lbs
Shipping Dimensions: 14 x 12 x 4 in
Manufacturer Part Number (MPN): BLX14/SM31-H11
If you have additional warranty questions, please contact the manufacturer at 800-25-SHURE
(3 ratings)
Submitted November 18, 2017 by Scot R in Coudersport, PA
"This soungs the best. "
Verified Customer zZounds has verified that this reviewer made a purchase from us.
Me and my Girlfriend are Zumba instructors. We purchased two of these to teach class. We put the bodypack receiver in a sandwich bag to keep them sweat free. Although the Mic is water proof, the bodypack is plastic and the electronics could be easily damaged. We bought waist holders from amazon which work best. We have tried two other brands that were cheaper but Shure is the best. Wish they sold a hard case like the older Shure handheld.
Musical Background:
DJ, and fitness instructor
Musical Style:
Pop dance.
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Band H9 (512-542 MHz)

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