RAI Stereo Array

A near-coincident stereo microphone array conceived by the Italian broadcaster Radio Audizioni Italiane (RAI) in the early 1960s. It comprises a pair of cardioid microphones with capsules spaced 21cm apart at a mutual angle of 100°. The resulting SRA is 93 degrees. This technique captures both time and level differences between channels, and is comparable to similar techniques such as NOS, ORTF, DIN, EBS, and others.