Long time reader, first time caller.  In lots of the reviews the excursion capabilities of the drivers are stated E.G on the 2269H: How is this measured? I have some low cost drivers (Pyle plpw15d) with a stated xmax of 8mm, however the other T/S parameters were  not correctly stated by the manufacturer.   They seem to start making bad noises far beyond 16 mm peak to peak, the top plate looks to be about 6-8 mm thick  (hard to get calipers in).  I would like to have a better idea of