It's not often something really new comes along in the Room Acoustics field, but Marshall Day Acoustics has just released a new measurement system that promises to provide a dramatic step forward in being able to understand the acoustics of rooms. The system comprises a tetrahedral microphone that can resolve the sound field into different directions, and software that can analyse the signals from the four microphones and present the information in simple yet elegant way that aids ones understanding of the behaviour of the sound field.