OK, so that means that the high frequency drivers should be further from the listener than the lower frequency drivers. To attain the "coherence" you seem to be talking about, you'd need a slant faced cabinet with the drivers aligned parallel to the floor. That's how "time coherent" speakers are designed (like Thiel, Dunleavy, MM deCapos, Meadowlarks, etc.)

Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.