Is this a Voight-Kampff test to detect if you are an audiophile?
Does that make you Rachel?
No, it's a straight forward question. I swear. :)
If the acoustical center of a driver is where the cone and voice coil come together (as Rodman99999 says above), then for the purposes of measuring the distance to the acoustical center of a two way, non-time aligned system where both drivers attach to a front baffle, is it preferable to use the woofer or the tweeter as the measurement point?
The difference isn't large, but there is a difference between the two drivers.