AKG/Crown CM311 A Head-Worn Condenser Microphone
Like new , tested and returned to case. Possibly the best mic ever made to fit with singing drummers (Phil Collins) or keyboardist  
Garth Brooks and Usher have been using it for years

Description

AKG CM311AXLRVMIC Rugged Headworm Mic for Presenters

BE DIFFERENT
for touring and live-sound applications

The CM311 reference head-worn condenser microphone is designed for touring and live-sound applications. It sounds like the best handheld microphones full, clear and distortion-free, even with the loudest singers.

Differoid stands for differential cardioid, which cancels ambient noise from floor monitors, crowds and other sources. Controlled field tests show that the Differoid provides up to 12dB more gain before feedback than conventional cardioid microphones. Many users of CM311 say that their house mix is better because the mic's isolation is nearly complete.

Features:
  • Differoid noise-cancelling technology for highest ambient noise rejection
  • Cardioid polar pattern for outstanding gain before feedback
  • Condenser capsule with internal shock mount for efficient rejection of mechanical and body noise
  • Robust headband construction for maximum comfort and freedom of movement
  • With XLR connector for all wireless pocket transmitters
Specifications:

General
  • Audio Frequency bandwidth: 50 to 17000 Hz
  • Sensitivity: 1.25 mV/Pa
  • Equivalent Noise Level: 26 dB-A
  • Signal to Noise: 68 dB-A
  • Electrical Impedance: 75 Ohms
Polar Patterns
  • Cardioid
Powering Interface
  • Voltage: 18 to 48 V
Audio Output
  • Type: Mini XLR
  • Gender: Female
  • Contacts: 3-pin