What is the polar pattern and how does it help with noise rejection?

The CM311 uses a cardioid pattern that focuses sound capture from the front while rejecting off-axis noise from the sides and rear. Combined with the internal shock mount, this design isolates the wearer's voice and suppresses ambient room noise, mechanical vibrations, and handling interference.

Is this microphone suitable for instrument miking or studio recording?

No, the CM311 is optimized for live performance, broadcast, theater, and conferencing applications. It is not designed for studio instrument miking or general session recording, where other microphone types and placement methods are more appropriate.

What are the weight and comfort specifications for extended wear?

The CM311 weighs only 61 grams and features a robust headband construction designed for comfort and stability during long performances or broadcasts. Its lightweight, unobtrusive design allows freedom of movement without fatigue.

What connector and impedance does the CM311 use?

The CM311 outputs via a standard XLR 3-pin female connector and has an impedance of 75 Ohms, making it compatible with professional audio interfaces, mixing consoles, and wireless bodypack transmitters.

How does the signal-to-noise ratio affect audio quality?

A 68 dB-A signal-to-noise ratio with an equivalent noise level of 26 dB-A ensures clean, articulate audio reproduction with minimal self-noise. This specification means the microphone itself contributes very little background hiss, keeping your captured audio clear and professional.

AKG CM311 Reference Head-Worn Condenser Microphone XLR Version

The AKG CM311 mounts securely on the head with minimal weight, freeing up your hands and your sight lines during live performance. Built for touring musicians, worship leaders, theater actors, and presenters, this cardioid condenser isolates your voice while rejecting crowd noise, stage rumble, and handling vibration through its internally shock-mounted capsule design. Stay mobile and miked without the constraint of a handheld or lavalier.

Audio Performance

This condenser microphone operates across a 50–17,000 Hz bandwidth with a 68 dB-A signal-to-noise ratio and 26 dB-A equivalent noise level, delivering clean, articulate reproduction on stage and in the mix. The 1.25 mV/Pa sensitivity and 75 Ohm impedance integrate reliably with standard professional audio interfaces, wireless transmitters, and mixing consoles.

Design & Build

The robust headband construction holds steady through an entire set, while the internal shock mount suppresses body noise and vibration from movement and stage activity. At just 61 grams, the microphone stays out of your way, allowing full freedom of motion without fatigue or distraction.

Key Features

Cardioid polar pattern for focused sound capture and rejection of off-axis noise
Condenser capsule with internal shock mount for mechanical noise rejection
Audio frequency bandwidth: 50–17,000 Hz
Sensitivity: 1.25 mV/Pa
Signal-to-noise ratio: 68 dB-A
Equivalent noise level: 26 dB-A
Electrical impedance: 75 Ohms
XLR 3-pin female connector output
Lightweight construction at 61 grams
Compact capsule dimensions: 17.76 mm × 13.97 mm × 7.62 mm
Head-worn design for hands-free operation
Robust headband construction for comfort and stability

The CM311 delivers reference-quality audio in a discreet, head-worn form factor suited to live performance, worship, theater, instruction, and any stage or venue application where mobility and consistent isolation matter.

Condition	New
Country of Manufacture	China