The fully-automated software 3PASS lab exactly reproduces background noises in different test rooms in terms of level, frequency as well as spatial and temporal distribution in the area of the device under test. Application-specific microphone arrays (MSA I or MSA II) allow to record sound fields and to equalize the multi-channel background noise simulation system. Here, the equalization of the whole system is digital and fully-automated – one of the main advantages of 3PASS lab.