Speaker
Description
Reproducing surround audio via a horizontal ring of 3D point-source loudspeakers is termed 2.5D synthesis. Such layouts were recently proven incapable of producing spatially extended diffuse sound fields when fed with mutually uncorrelated signals. Could feeding the loudspeakers via 2.5D sound field synthesis help?We show that the horizontal ring layout of vertical line sources is the ideal 2D layout and permits full control with convolutional driving functions. Such functions are general enough to also include 2.5D WFS or 2.5D Ambisonics with spectral division. But no convolutional driving function can help a 2.5D layout synthesize extended diffuse fields from uncorrelated input. While active sound intensity must vanish in the ideal diffuse field, convolutional driving functions for 2.5D inevitably produce net inward sound intensity.