Sloped baffle

It is used to time align the drivers. Some manufacturers do this physically, (with the cabinet) and some do it electronically (in the crossover).

Just a different means to an end. You can have good or bad sound with either arrangement. One way isn't necessarily better than the other...

I recall seeing the terms "time coherent" and "phase coherent." Do these terms mean the same thing or are they different?

Since this thread speaks to speaker alignment, perhaps someone could explain in layman's terms what causes speaker to operate out of phase. Does it have something to do with the use of caps and chokes in the x-over? Or perhaps the attribute of a dynamic speaker creating its own back EMF by reason of the voice coil moving in a magnetic field??

Incidentally, do all these electrical dynamics operating in tandem cause the electrical phase shifting that gives most amps a headache?

Thanks

Mofimadness answered correctly
About time alignment.As far as phasing... it is simply having your individual drivers operating
In unison at all frequencies... As you change crossover points and slopes, phasing changes between drivers.... Correct time and phase alignment is what seperates many ok speakers
From world class speakers... These factors are why so many audiophiles like sigle drivers or point source.... I hope this helps, Tim