The AKG Model C 4000 B
multi-directional condenser microphone
The C 4000 B was engineered from the ground up to take advantage of developments in low noise surface mount circuitry and electret technology to produce a microphone with an astounding dynamic range of 137 dB. The microphone’s noise floor is a low value of 8 dB-A, and it reaches a reference value of 0.5% THD at a level of 145 dB.
The capsule assembly has been internally shock mounted, and the grid/screen structure is 0.2 inch (3 mm) thick to reduce wind and breath pops with minimal effect on high frequency performance. The diaphragm assembly is the industry’s first back plate electret dual 1 inch (25 mm) diameter design, and it reflects recent developments in electret technology that assure both long-term stability and very high equivalent dc voltage biasing.
The C 4000 B reflects AKG’s customary attention to subtleties of frequency response: the transformerless output gives rock solid low frequency performance, and the 6 micron gold-sputtered diaphragms provide extended high-frequency performance. Switchable 10-dB padding extends the operating range even more, and a 12-dB/octave low cut at 100 Hz removes rumble or excessive proximity effect.
While the C 4000 B is primarily intended for studio use, it will be equally at home in broadcast operations or on stage for vocal applications of the highest quality. Polar patterns are omnidirectional, cardioid, and hypercardioid.