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The ''IRT Cross'' principle (after Günther Theile) is a microphone setup for ambience recording. The 4 microphones are arranged in such a way that in pairs they produce an ORTF-like arrangement which has a recording angle of approximately 90°. This results in a uniform 360° image.
Due to the distances between the microphones, the diffuse field correlation is low and thus very good spatial imaging is achieved. The 4 signals of the IRT cross are discretely routed in 5.1 surround to L, R, LS, RS.
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