Sound, light...it's all waves
This is what Mr. Jones had to say on another forum "For Atmos, there is a prescribed directivity that is required for the top driver in order to get the best result, along with some processing to compensate for any leakage of the upwards driver into the forward direct field. My new driver achieve the required directivity. A lot of the speakers you will see will utilize a
single full range speaker for the top driver. I chose instead to use the identical driver as I use for the front. This way, I maintain identical phase responses between the drivers, which I believe will give a more seamless soundfield and more accurate placement of sounds in the object oriented approach that Atmos uses."