The low-profile Audio-Technica AT4021 is a cardioid condenser mic that offers a flat, extended frequency response, high maximum SPL and wide dynamic range. The AT4021 microphone’s low self-noise is perfectly suited for the most sophisticated recording equipment. The AT4021 has a low-mass diaphragm that improves transient response, increases response bandwidth and reduces handling and mechanical noise transfer. The Audio-Technica AT4021 microphone offers you outstanding reproduction of low-frequency sounds. Requires 48V DC phantom power.