The AKG C 451B is a cardiod condenser microphone, designed for recording instruments with high transient response, and therefore popularly used for drum kit and percussion recording.
The C 451B features a light diaphram, minimizing handling noise, and a switchable 75Hz/150Hz highpass filter, eliminating low-end rumble. The High Pass filter enhances the "airy" character of the audio signal, and thus the microphone is a viable solution for overhead cymbal or hi-hat recording.
The The C 451B provides a flat, on-axis frequency response, capturing the performance without any signal coloration. The microphone provides both 12V and 48V phantom power, with selectable 10dB/20dB pads included for better signal management.