The horn design of the SRM and SRMv2 loudspeakers was in part inspired by the exponential horn design of big, high-output studio monitors. But while this design allows for smoother on-axis response and lower distortion, it's subject to dispersion problems off axis. Many other loudspeakers use a similar design, and claim "90° horizontal dispersion." What they don't tell you is that this dispersion pattern only applies to certain frequencies. In the diagram, you'll see that at higher frequencies, the dispersion pattern of other loudspeakers is significantly narrower. This is due to poor pattern control, or uneven dispersion. So stand off-axis, and you're getting an uneven distribution of frequencies, resulting in, to put it bluntly... crappy sound.

But our engineers found a way to solve the problem of poor pattern control—a High Frequency Waveguide with exponential geometry obtains both the desired dispersion pattern and lower distortion. (Diagram) By employing an exponential high frequency waveguide, our design eliminates the high-frequency forward beaming pattern, and instead distributes highs as broadly as the lows. As a result, that great sound you hear on-axis, is equally great off-axis.