Sloped baffle

I think there is a lot of hype around this issue. A lot. If you have floor standing speakers and simply adjust the spikes so the front is slightly higher to accommodate your sitting position the you may have it.

Is this just all a bunch of hype? Are there other more serious considerations? Cabinet construction, drive quality?

Probably

Simply putting the voice coils in the same plane does guarantee a cohesive and coherent sound.

Drivers that are placed close together are just as important for a cohesive sound.

It is equally important to have a bass driver that is as fast as the midrange otherwise you end up with a bass that seems disconnected. I hear this in some very expensive speakers.

I have a question. If an 18kHz sound left its' source and a 30Hz sound wave left its source at the same time. would they both get to the listener at the same time?

If you were to try to line up the drivers how would you find the " acoustic center" of a driver. In a midrange or woofer would that be about half way out from the center or would it be further out because the majority of the area of a larger driver would be closer to the perimeter?

Wouldn't it be easier just to tilt the speaker slightly backwards? I just want to listen to good music