It's my opinion that stereo loudspeakers are generally designed wrong!
Most speakers are measured and designed for optimum on-axis performance and usually have very poor off-axis.
This would be okay if we listened to one speaker directly in front of us.
However with stereo music, we are seated between two speakers and listening to their 30-45 off-axis response.
The poor off-axis response forces us to aim the speakers at our ears (toe-in) to get good sound. This creates a very small "sweet spot" and also distorts the soundstage width and depth.a3
was designed for its off-axis response.
Below is an unsmoothed graph of quick measurements of our prototype.
You'll see the on-axis (yellow) is the worst but still within a +/- 3db window.
The more important 15(red), 30(brown), and 45(green) degree measurements are almost identical, providing better response over a much wider listening area, and requiring little to no toe-in. Even at 45 degrees, we have extended response well past 20k, and there is also no sign of the crossover in any of the response curves