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.

• The original IRT cross is realised with cardioids. However, also super-cardioid can be used. Then, the sound is slightly different due to the larger level differences and the smaller channel coherence.
• mounting bar
• for ambience recording in 5.1 surround according to the "IRT cross" technique
• for 4 cardioids or super-cardioids CCM/CMC 1L + MK 4 or 41
• resulting capsule distance: 250 mm
• including elastic mount Rycote INV-6 HEAVY