I find this surprising - with regard to the physics of dispersion. Bass frequencies are omnidirectional and treble frequencies are progressively more directional. Waveguides are used to increase dispersion of highs - eg in studio monitors. So dispersion is determined by frequency and the shape of the radiating surface and its surround.
If DSP can impact beaminess, the control might involve filtering highs that contribute to the perception of beaminess. Otherwise, DSP can control the levels of each frequency but it can also control the phase. Perhaps phase effects can impact perceptions of beaminess. I would be interested in some clarification from Kemper staff.