M55 Series

Adjustable Hanging Ceiling Microphone

The M55 hanging ceiling microphone system is designed for applications where aesthetics, sound quality, and ease of installation are critical. The primary applications for the ceiling-mounted M55 include Video & Teleconference (VTC), distance learning, hospital rooms, surveillance, and ambient room miking.

The M55 conferencing microphone accommodates interchangeable capsules with cardioid, hypercardioid, omnidirectional, and supercardioid (shotgun) coverage patterns. All electronics are fully integrated with high sensitivity and low noise. The signal output is balanced to eliminate RF interference caused by cell phones and mobile devices.

Installing the M55 hanging microphone requires drilling just one 5/8-inch hole in the ceiling, with no additional tools needed. The M55’s mounting hardware easily adjusts the hanging height up to four feet from the ceiling surface without removing ceiling tiles. An optional aiming clip (MCHANGER) easily makes any additional angular adjustments. The cable assembly, with a terminal block connector, is neatly housed in an airtight, plenum-rated junction box. A wire safety cable provides additional seismic restraint.

Designed, machined, assembled, and tested by Audix in the USA.

Note: The M55 Series has several model options. Please see below.

Where To Buy
  • Specifications
  • What’s in the Box?
  • Model Options and Variations
  • Guides and Manuals
Transducer Type Condenser
Frequency Response 60 Hz – 10 kHz
Polar Pattern Cardioid / Hypercardioid / Omni/ Shotgun
Output Impedance 150 ohms
Sensitivity 38 mV (C), 32 mV (HC), 40mV (O), 60 mV (S) / Pa @ 1k
Equivalent Noise Level 22 dB (A-weighted)
Signal to Noise Ratio 72 dB
Maximum SPL ≥130 dB
Dynamic Range 108 dB
Power Requirements 18 – 52 V phantom
Connector Terminal Block Connector
Polarity Positive pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of output XLR connector
Materials / Finish Aluminum & Zinc Alloy / White Finish
Weight 70 g / 2.4 oz (Mic & Cable) 499 g / 17.6 oz (Junction Box & Safety Cable)
Length 54 mm / 2.1 in
Download Spec Sheet

1x M55 Ceiling Microphone
1x CONN170F Terminal Block Connector, 4-ft Integrated Microphone Cable
1x CONN170M Mating Terminal Connector
1x JBM55 Metal Plenum Junction Box

  • M55W – Hanging ceiling cardioid microphone with adjustable cable, strain relief, high output, RF immunity. White. Requires 18 – 52 V phantom power.
  • M55WHC – As above, with a hypercardioid capsule. White.
  • M55WO – As above, with an omnidirectional capsule. White.
  • M55WS – As above, with a shotgun capsule. White.