Quick Facts
David Clark M-7/DC noise-canceling electret replacement microphone for compatible wire-boom aviation headsets and flight helmet communication systems.
- Manufacturer: David Clark
- Model: M-7/DC
- Manufacturer Part Number: 09168P-31
- Microphone Type: Electret
- Noise Canceling: Yes
- Boom Compatibility: Designed for compatible wire booms
- Electrical Requirement: Requires a compatible circuit that supplies DC bias voltage
- Aviation Survival Part Number: AVS-2007
David Clark M-7/DC Microphone Overview
The David Clark M-7/DC is a noise-canceling electret microphone designed for clear voice transmission in compatible aviation communication systems. It is intended for use with wire-style microphone booms and can replace certain carbon and amplified dynamic microphone configurations when the communication circuit is electrically compatible.
The M-7/DC helps reduce surrounding ambient noise while keeping transmitted speech clear and understandable. It is a practical replacement for a damaged or worn microphone in a compatible David Clark headset or professionally configured flight helmet communication system.
Important Compatibility Note: The M-7/DC requires a communication circuit that supplies DC bias voltage. It will not operate correctly in a circuit that does not provide the required voltage. Verify the headset or helmet wiring, microphone boom, cord, connector, intercom, and aircraft radio configuration before ordering.
Who Is This Microphone For?
The David Clark M-7/DC may be a suitable replacement for:
- Owners repairing a compatible David Clark wire-boom aviation headset
- Flight helmet users replacing an existing M-7/DC microphone
- Civilian aviation communication systems that provide the required DC microphone bias
- Helmet repair facilities completing a compatible electret microphone installation
- Operators who already have a serviceable boom, cord, and mounting system
Will the M-7/DC Fit My Headset or Flight Helmet?
| Item to Check | Compatibility Requirement |
|---|
| Existing Microphone | Confirm that the existing microphone is an M-7/DC or an approved electrically compatible replacement. |
| Boom Style | The microphone is designed for a compatible wire-style microphone boom. |
| Electrical Circuit | The communication circuit must supply the DC bias voltage required by an electret microphone. |
| Microphone Cord | The microphone contacts and cord must match the boom and headset or helmet wiring. |
| Aircraft System | Confirm compatibility with the aircraft intercom and radio system. |
Helmet or headset brand alone does not guarantee compatibility. The exact model and complete communication configuration must be checked.
What Is Included?
- One David Clark M-7/DC electret microphone
- Manufacturer part number 09168P-31
The microphone boom, microphone cord, wind cover, mounting hardware, earphones, and main communication cord are not included unless selected separately on this page.
Installation and Microphone Positioning
Correct microphone installation and placement are important for clear transmission and effective noise cancellation. Position the microphone close to the mouth and verify that the speaking side is oriented correctly.
Professional installation is recommended when the headset or helmet requires wiring changes, connector replacement, boom modification, soldering, or an impedance conversion.
Why Buy from Aviation Survival?
- Experienced flight helmet repair and communication-system support
- Help identifying compatible microphones, booms, cords, and covers
- Professional flight helmet inspection, repair, and installation services
- Support for civilian, military, public-safety, and commercial aviation operators
Frequently Asked Questions
Is the David Clark M-7/DC an electret microphone?
Yes. The M-7/DC is a noise-canceling electret microphone designed for a compatible powered communication circuit.
Does the M-7/DC require electrical power?
Yes. The microphone requires a communication circuit that supplies DC bias voltage. It will not operate correctly in an unpowered or incompatible microphone circuit.
Is the M-7/DC a low-impedance military microphone?
No. It should not be treated as a direct replacement for a low-impedance dynamic military microphone such as an M-87 or M-2. A communication conversion may be required when changing between microphone system types.
Will this microphone fit every David Clark headset?
No. The headset must use a compatible wire boom, microphone connection, cord, and electrical circuit. Confirm the headset model before ordering.
Is this the same microphone as the David Clark M-7A?
No. David Clark lists the M-7/DC and M-7A under separate model names and manufacturer part numbers. Order the model specified for your headset or helmet communication configuration.
Does this listing include the microphone boom?
No. This listing is for the replacement microphone only. Compatible booms, cords, mounting components, and microphone covers may be purchased separately.
Can Aviation Survival install the microphone?
Yes. Aviation Survival provides flight helmet communication repair and component installation services. Send us the helmet or headset model and photographs of the existing microphone, boom, cord, and connector for assistance.
