Axis of “OFF”?

‎”Most people actually listen to a speaker off axis. Not necessarily horizontally, but vertically; they’re either too low or too high. All two way speakers have one inherent fault and that’s that as you go off axis there’s a time delay between the tweeter and the woofer – introducing a very small phase shift into the sound, which you can hear”. Listen to the full Andy Munro interview https://soundcloud.com/seelectronics/andy-munro-se-egg-interview