My impression was that EBA delays the drivers progressively across the frequency range to compensate for the fact that a tweeter will start moving more rapidly than a woofer, i.e. it takes a few ms longer for a woofer to complete it's excursion to send out a sound than is the case for a tweeter.

So, a lot of delay for the tweeter, some delay for the mid, and no delay for the woofer, in order to allow even more precise sync across the full spectrum.

Cheers

George