Having briefly touched on this earlier in the thread, Ive been biting my tongue on this topic for some while now. The pic above show my ebony and rosewood cups together. You can see the obvious difference in grain cuts, Chan was kind enough to let me choose my cups and I singled out both sets for their distinctive features.
Im surprised to read that some people cant tell the sonic differences between ebony and rosewood because with my cups the difference is obvious. My rosewood have great, tight bass with plenty of sparkle in the treble. They are my favorite cups above the teaks. While my ebony seem to be much tubbier, with maybe more bass thud, but at the cost of a muffled high end.
Its my opinion that the difference in sound characteristics owe more to the grain cut than the type of wood used. Of course different woods will have inherent qualities, but each individual cup has different resonance, owing to many different factors.