Beside the conception and the phase/time differences, every same concept speaker has to have a different phase/timing.
The reason is simply that the physical distances from each chassis to your ear is different and therefore the time/phase.
The perfect goal would be that all frequencies from the different chassis arrive your ear at the same moment, so a square pulse from the source should arrive your ear also as a square pulse in kind of a acoustic pressure pulse - the same shape as the electrical signal.
800v3/218/271/8k.2/5k5s

/5kC/DSP3200/Reviver/
TT-ELP/Graham Slee Revelation/Trinnov Altitude 32/OPPO 205
__Ayon/HB/Shunyata/Miltzow -- power cables,
__Ayon/Jungson/Miltzow --analog, Miltzow-- digital,
__Vortex/WMA ,