Check the listing for details. AKG C4000b Dual Diaphragm Selectable Pattern Condenser Mic. Condition: Used. Listed at 385.00 USD. AKG Model: C 4000 B Dual Diaphragm Condenser Microphone Sensitivity-32 dBV/Pascal Impedance 200 Ohm Frequency Response 20 Hz to 20,000 Hz Total Harmonic Distortion (THD)0.5 % Noise Level 8 dBA Dynamic Range137 dB Maximum input: 145 dB Height 7.2 in Diameter 2.3 in Weight 15.87 oz 48v Phantom PowerWind screen and shock mount included One of the most silent condenser microphones available today; up front sound in the mix; selectable cardioid, hypercardioid and omnidirectional polar patterns for every recording situation. The genuine 1-inch dual-diaphragm condenser transducer with selectable cardioid, omnidirectional, and hypercardioid polar patterns will enchant you with its unique state-of-the-art sound. Designed for miking up vocals, brass, acoustic and electric guitar, and kick drum, the C4000 B can handle every recording situation. Exceptionally high headroom and extremely low self noise put the C4000 B among the condenser microphones with the widest dynamic range available today and it will give equally excellent results in the studio and on stage. A switchable 10-dB pre-attenuation pad allows the C4000 B to be used for close-in micing of instruments producing extremely high sound pressure levels such as guitar amps etc. A switchable bass cut filter eliminates low-frequency noise.