SHURE BLX14/SM31 Wireless Headset System

FEATURES

BLX4 Receiver Features

• Up to 12 compatible systems (region dependent)
• Microprocessor-controlled internal antenna diversity
• One touch QuickScan locates the best open frequency
• ¼" and XLR audio outputs
• Two colour audio status indicator LED
• Green: Normal audio levels
• Red: Excessive audio levels (overload/clipping)
• Not rack-mountable

BLX1 Bodypack Features

• For use as part of BLX and BLX-R Analogue Wireless Systems
• Power and battery status LED
• Adjustable gain control
• Quick and easy frequency matching
• AA batteries provide up to 14 hours of continuous use
• 100 m (300 ft.) operating range (line of sight)

SM31 Headset Features

• Wearable wireframe headset with secure, comfortable fit made for fitness and aerobics instructors
• Integrated moisture-repelling hydrophobic fabric protects the microphone element from harmful corrosion for use in humid environments
• Flexible gooseneck provides discrete adjustment options to optimize placement for greatest isolation
• Lightweight and low-profile form factors stave off fatigue during high-impact use
• Compatible with Shure wireless bodypack systems for direct replacement of TA4F-connected microphones
• Included windscreen tames plosive, breath and wind noises for clean and intelligible sound
• Tailored frequency response refined for crisp and clear vocal reproduction

The Shure BLX14/SM31 Wireless Fitness Headset System combines professional-quality sound with simple setup and up to 14 hours battery life for legendary audio performance right out of the box. The system includes BLX4 tabletop single-channel receiver, SM31FH headset microphone (w/ moisture-repelling construction) with BLX1 bodypack transmitter, clothing clip, power supply, 2 AA batteries, windscreens, and user guide.

WHAT'S IN THE BOX

• 1 x BLX4 Wireless Receiver
• 1 x BLX1 Wireless Bodypack Transmitter
• 1 x SM31FH Headset
• 1 x PS24 Power Supply
• 1 x Clothing clip
• 1 x Windscreen
• 1 x 95E16526 Carrying Case

SPECIFICATIONS

• Working Range: 91 m (300 ft) Line of Sight Note: Actual range depends on RF signal absorption, reflection and interference.
• Audio Frequency Response: 50 to 15,000 Hz Note: Dependent on microphone type
• Total Harmonic Distortion: Ref. ±33 kHz deviation with 1 kHz tone 0.5%, typical
• Dynamic Range: 100 dB, A-weighted, typical
• Operating Temperature: -18°C (0°F) to 57°C (135°F)
• Polarity: Positive pressure on microphone diaphragm (or positive voltage applied to tip of WA302 phone plug) produces positive voltage on pin 2 (with respect to pin 3 of low-impedance output) and the tip of the high impedance 1/4-inch output.

BLX4 Receiver Specifications

• 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: 1.57 in. X 7.40 in. X 4.06in. (40 mm X 188 mm X 103 mm) H x W x D
• Weight: 8.5 oz. (241 g)
• Housing: Molded ABS
• Power Requirements: 12–15 V DC @ 235 mA (BLX88, 320 mA), supplied by external power supply (tip positive)

BLX1 Bodypack Specifications

• Audio Input Level
  • max: -16 dBV maximum
  • min (0 dB): +10 dBV maximum
• Gain Adjustment Range: 26 dB
• Input Impedance: 1 MΩ
• RF Transmitter Output: 10 mW, typical (varies by region)
• Dimensions: 4.33 in. X 2.52 in. X 0.83 in. (110 mm X 64 mm X 21 mm) H x W x D
• 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)

SM31 Headset Specifications

• Type: Electret Condenser
• Frequency Response: 45 to 20,000 Hz
• Polar Pattern: Unidirectional (Cardioid)
• Output Impedance @ 1 kHz: 600 Ω
• Audio Output Level: -50 dBV/Pa
• Signal-To-Noise Ratio @ 1 kHz: 66 dB
• Maximum SPL 1000 Ω load, @ 3% THD: 145.0 dB
• Dynamic Range @ 1 kHz, 1000 Ω 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.)