The Shure BLX188/SM31 Wireless Dual Fitness Headset System combines professional-quality sound with simple setup and and up to 14 hours battery life for great audio performance for two presenters right out of the box. The system includes BLX88 tabletop dual-channel receiver, 2 SM31FH headset microphones with BLX1 bodypack transmitters, lavalier clips, power supply, 2 sets of AA batteries, windscreens and user guide.

Product Features

BLX88 Dual 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

Product Specifications

System 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.

BLX88 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:  1.50 in. X 12.13 in. X 3.98in. (38 mm X 308 mm X 101 mm) H x W x D
• Weight:  15.1 oz. (429  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.)

What's in the Box?

• 1 x BLX88 Dual Wireless Receiver
• 2 x BLX1 Bodypack Transmitters
• 2 x SM31 Headset
• 1 x PS24 Power Supply
• 2 x Clothing clips
• 2 x Windscreens