By: Shure
Microphones, Headphones & Wireless systems
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Microflex Wireless Boundary Microphone
The Shure Microflex Microphone Series MX 690 offers total freedom of placement with no holes to drill or cables to run for installation.

The MX 690 Wireless Boundary Microphone is the perfect solution for conference and meeting spaces where users demand flexibility and high performance. Compatible with Shure SLX® Wireless Systems.
Sleek, low profile design
Frequency agile, microprocessor controlled transmitter
Bi-color status indicator
IR link to SLX receiver for automatic frequency synchronization
Programmable mute function
Battery level indicator
Operates on two AA batteries
Logic output for remote LED and mute control
CommShield Technology for improved RF filtering
Type Condenser (electret bias)
Frequency Response 50–17000 Hz
Polar Pattern Cardioid
Sensitivity (at 1 kHz , open circuit voltage) –33 dBV/Pa (33 mV); 1 Pascal=94 dB SPL
Dynamic Range 96 dB (1 k ohm load at 1 kHz)
Common Mode Rejection 45 dB minimum (10 Hz to 100 kHz)
Preamplifier Output Clipping Level -6 dBV (0.5 V) (1% THD)
Polarity Positive sound pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of output XLR connector or tip of 1/4” phone plug
MX690 and MX890 Transmitter See below Specifications
Operating Range 30 m (100 ft.); Note= Actual range depends on RF signal absorption, reflection, and interference
Frequency Stability ±10 ppm
Maximum Frequency Deviation 45 kHz
Oscillator Type Phase-locked loop (PLL) controlled synthesizer
Power Requirements 3V (2 AA alkaline or rechargeable batteries)
Battery Life 8 hours (alkaline)
Power Consumption 130 mA, ±15 mA
Operating Temperature Range -18–57 °C (0–135 °F); Note= Battery may limit this range
Dimensions 43 mmH x 87 mmW x 148 mmD (1 11/16 x 3 3/8 x 5 13/16 in.)
Weight Net= 318 g (11.2 oz); Packaged= 516 g (18.2 oz)

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Prices and specifications subject to change without notice.