The Audio Technica AT4051a is a small diaphragm, transformerless studio microphone designed for voice and instrument recording as well as sound reinforcement. The microphone features a cardioid polar pattern which effectively minimizes off-axis pick up resulting in focused and accurate sound reproduction. The microphone is modular and consists of 2 modular assemblies which are threaded together. The AT4900-48 handle and power supply, and the AT4051-ELE capacitor head capsule. This flexible design allows the use of optional accessory head capsules, increasing versatility in any recording and sound reinforcement application. The AT4051a handles sound pressure levels (SPL) up to 143dB at no greater than 1% THD, a suitable solution for percussion and drums as well as brass and other sources high in volume. The microphone features a frequency response of 20Hz to 20kHz with a low cut roll-off switch, eliminating low end noise and "popping" below 80Hz.