The Sennheiser MKH 50 is one of four professional-grade, studio-recording microphones (MKH 20, MKH 30, MKH 40, MKH 50). In particular, the MKH 50 is a pressure-gradient mic with a super-cardioid pick-up pattern where it’s more sensitive in the front, but it rejects more sound entering within 150-degrees to the rear.