AKG introduces the new C451B. Featuring the airy sound of AKG?s classic AKG C451EB + CK1, the new C451B was developed in response to a high demand for the original from both recording and tour sound engineers worldwide. Switchable 10 dB or 20 dB pads increase the microphone?s SPL capability, and a switchable highpass filter at 75 Hz or 150 Hz prevents low-end distortion. Cardioid polar pattern, 20 - 20,000 Hz frequency range.