Shure BLX188E/SM31 – Wireless Dual Fitness Headset Microphone System

Wireless Dual Fitness Headset System with two SM31FH Headset Microphone

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.

SUPERIOR AUDIO – Perform with Confidence
Get the show going with no wires attached. Professional Shure sound for every band and any vocal need.

RELIABLE SIGNAL – Extend your range
With a range of up to 300 feet (100m), you can take the show into the crowd without interruption.

EASY SETUP – Own the stage
BLX will have you up and running in record time with one-touch scan and selection.

BATTERY LIFE – 14 hours of power
Because BLX transmitters get up to 14 hours of power from a single pair of AA batteries, the show can go on and on (and on).

SYSTEMS EXPANSIONS – Run up to 12 channels per frequency bandx
You’ll probably need to find a bigger stage before you run out of channels.
xNote: region and environment dependent.

VERSATILITY INCLUDED – You’ve got options
An impressive variety of Shure microphones are available in BLX systems, so you can find what works for you.

SPECIFICATIONS
SYSTEM
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)

Note: Battery characteristics may limit this range.

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.

BLX1
Audio Input Level
max -16 dBV maximum
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

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)

BLX2
Audio Input Level
0dB -20 dBV maximum
-10dB -10 dBV maximum
Gain Adjustment Range

10 dB

RF Transmitter Output

10 mW, typical

varies by region

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)

BLX4
Output Impedance
XLR connector 200 
6.35 mm (1/4″) connector 50 
Audio Output Level

Ref. 33 kHz deviation with 1 kHz tone

XLR connector -27 dBV (into 100 k load)
6.35 mm (1/4″) connector -13 dBV (into 100 k 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)

BLX88
Output Impedance
XLR connector 200 
6.35 mm (1/4″) connector 50 
Audio Output Level

Ref. 33 kHz deviation with 1 kHz tone

XLR connector -27 dBV (into 100 k load)
6.35 mm (1/4″) connector -13 dBV (into 100 k load)
RF Sensitivity

-105 dBm for 12 dB SINAD, typical

Image Rejection

>50  dB, typical

Housing

Molded ABS

Power Requirements

12-15 V DC @ 235 mA (BLX88, 320 mA), supplied by external power supply (tip positive)

What’s in the box
1 x BLX88 Dual Wireless Receiver with Power supply
2 x SM31Fitness Microphone
2 x BLX1 Bodypack Transmitter
2 x AA Batteries