Lack of auditioning possibilities is my main gripe with Omega. Met Louis and heard his offerings at a MidWest Audio Fest about 16 years ago (all speakers/drivers have since changed). Nice guy, but the only company marketing budget is him picking up the phone.
The theory goes that drivers 'beam' high frequencies (like a flashlight) when the driver size is bigger than the wavelength. Note that sound travels at 13,200 inches per second in air at sea level, so a 13,200 Hz signal is 1 inch long and beaming in a 1 inch driver would start above that frequency and a 5 inch driver would start to beam above 2,640 Hz. The point is as frequency goes up the "sweet spot" would become narrower for a single driver speaker. Simple physics.