Microphones are available which make use of two units to secure a particular directional pattern. A dynamic unit is often combined with a ribbon unit. Fig. 2.25 shows the directional pattern which results when a bidirectional velocity unit and a nondirectional dynamic unit are combined.
The resultant directivity pattern is a cardioid. Other units are also combined to secure specific directivity patterns.
Fig. 2.25 Directivity pattern of a dual-unit microphone
A superb combination from Sennheiser is shown in Fig. 2.26. The MKH 30 is a pressure gradient microphone with a figure-of-eight directivity, optimising wide ...