Lectrosonics WM Watertight Wireless Microphone Transmitter with M152/WP Lavalier Mic



  • For Theater, Live Stage, TV, & Film
  • 24-Bit Digital Audio with Analog FM Link
  • 35 Hz to 20 kHz Frequency Response
  • 25 or 100 kHz Tuning Steps
  • Up to 3,072 Selectable Frequencies
  • Wide Range Input Gain Control
  • LED Indicators
  • Compatible with Analog Receivers
  • Runs on Rechargeable Lithium-Ion Battery
  • Includes Belt Clip and Battery Charger


Lectrosonics WM Overview

The WM Watertight Wireless Microphone Transmitter by Lectrosonics is designed to operate in wet or dusty environments. The WM resists damage in harsh environments, but also offers a comprehensive feature set that makes it equally at home in film, television, and on stage.

The WM’s input preamp is built of very high quality, low noise components with a wide gain range. The DSP-controlled input limiter has a range of more than 30 dB and a dual-release envelope, making it transparent while maintaining low distortion. Dual-color LEDs on the control panel accurately indicate audio input level for precise gain adjustment.

Lectrosonics patented Digital Hybrid technology revolutionizes wireless microphone transmission. Digital audio signal is converted and encoded for analog transmission, then decoded and converted back to digital audio at the receiver. The result is an exceptionally low noise floor with clear audio reception retained at greater distances. To meet the demand for both extended operating range and extended battery life, the WM transmitters offer selectable output power of 50, 100 or 250 mW.

The WM transmitter is made of solid, machined aluminum housing with a corrosion-resistant finish. The moisture-sealed control panel has a backlit LCD and enlarged membrane switches. The antenna is made of an extremely durable, multistrand alloy that will withstand heavy abuse. It is mounted with a compression sealed strain relief that prevents dust and moisture from entering the housing.

Lectrosonics WM Includes M152/WP Omnidirectional Lavalier Mic

The WM transmitter includes an M152/WP Omnidirectional Lavalier Microphone with Watertight Connection. It features a wide frequency response that accentuates the presence and character of the human voice. The omnidirectional polar pattern provides a generous response at the direct and off-axis sections of the microphone capsule.

Lectrosonics WM Variable, Selectable Output Power

The WM features selectable 50, 100, 250 mW output power.

Lectrosonics WM Watertight Construction

For smooth operation in wet or dusty conditions, The WM transmitter features O-ring sealed battery compartments and input jack, a compression sealed antenna port and gasket sealed control panel and back cover.

Digital Hybrid Wireless Architecture

Lectrosonics incorporates digital and analog audio technology to enhance range and eliminate the noise associated with compandor circuits.

Backwards Compatibility

The WM transmitter is completely compatible with all current Lectrosonics Digital Hybrid receivers and older Lectrosonics analog receiver models as well.

Extended Battery Life

The WM transmitter is powered by two lithium AA batteries, for up to 14.5 hours of continuous use.

SKU: WM Category:
Weight 545 g
Dimensions 249 × 199 × 77 mm

Operating Frequency 537.600 – 563.100 MHz
Channel Spacing 100 kHz
Frequency Selection Control panel mounted membrane switches
RF Power Output Switchable; 50, 100 or 250 mW
Compatibility Modes Digital Hybrid Wireless (400 Series), 200 Series, 100 Series, Mode 3, Mode 6, IFB
Pilot Tone 25 to 32 kHz; 5 kHz deviation (in 400 Series Hybrid Mode)
Frequency Stability ± 0.002%
Deviation ± 75 kHz max. (in 400 Series Mode)
Spurious Emission 60 dB below carrier
Equivalent Input Noise -125 dBV, A-weighted
Input Level
  • Dynamic mic: 0.5 mV to 50 mV before limiting; greater than 1 V with limiting
  • Electret lavaliere mic: 1.7 uA to 170 uA before limiting; greater than 5000 uA (5 mA) with limiting
  • Line level input: 17 mV to 1.7 V before limiting; greater than 5 V with limiting
Input Impedance
  • Dynamic mic: 300 Ohms
  • Electret lavaliere: Input is virtual ground with servo adjusted constant current bias
  • Line level: > 2.7 k Ohms
Limiter Soft limiter, 30 dB range
Bias Voltage(s) Selectable; 2V, 4V and Off
Gain Range 44 dB; panel mounted membrane switches
Modulation Dual bicolor LEDs indicate modulation of -20, -10, 0, +10 dB referenced to full modulation
Controls Control panel with LCD and four membrane switches
Low Frequency Roll-Off Adjustable from 35 to 150 Hz
Audio Frequency Response 35 Hz to 20 kHz, +/-1 dB
Signal to Noise Ratio SmartNR Off

  • no limiting: 103.5 dB
  • limiting: 108.0 dB

SmartNR Normal

  • 107.0 dB
  • 111.5 dB

SmartNR Full

  • 108.5 dB
  • 113.0 dB
Total Harmonic Distortion 0.2% typical (400 Series mode)
Audio Input Jack 2.5 mm locking micro; threaded for stainless sleeve on WP connector
Antenna Flexible, unbreakable steel cable
Batteries Two 1.5 Volt AA lithium
Battery Life
  • 50 mW: 14.5 hrs
  • 100 mW: 14 hrs
  • 250 mW: 7.5 hrs
Emission Standard 180KF3E
Dimensions 2.98 x 2.55 x 0.77″ (75.7 x 64.8 x 19.6 mm)
Weight 5.33 oz (151 g) with lithium batteries

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