History and current state of the war between the two main approaches to surround sound: discrete speaker feeds versus hierarchical matrix

40th AES Conference - Tokyo, 8-10 October 2010

Psychoacoustic criterions

At low frequency (<500 Hz), the gains are adjusted so that the pressure and particle velocity signals are carefully reconstructed at the center of the array, making use of “push-pull” effects obtained generating out-of-phase signals

At higher frequencies, the gains are adjusted so that the Sound Intensity vector recreated at the center of the array is as close as possible to the original one

Shelf filters are employed for making the gains frequency-dependent