The mounting bar CB 140/200/250 has a 3/8" thread for stand mounting. The microphone holders for 8 mm correspond to the SGCM stand clamp.
The "IRT Cross" 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 IRT cross is an alternative to the mounting bar "ORTF Surround Bar LM" - but without multicore function.
The number behind the CB indicates the spacing in mm in a microphone pair. The smallest bar CB 140 arranges each two supercardioids at a distance of 140 mm.