"Border" is a junction between two media with different speeds of sound. A border causes partial signal reflection in the opposite direction. EnABL blob thickness is comparable to cone material thickness, so, those thin, it presents a good border.
Wrong. Waterfall will show major resonances coming from standing waves. Standing waves deform some speaker cone areas between certain "static" lines - see Chladni figures.
Here is standing waves analysis for metal plate (Chladni figures) from Comsol site:
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In this case different speeds of sound exists only in the direction on the material thickness - not in the cone radial direction. So, "borders" are on the wrong places! Or, if there is an improvement on frequency response and waterfall diagram, then the underlying mechanism is different - not the one what you are talking about.
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A watefall also shows that. Again much easier to pick out from of the inherent resonances.
dave
But it doesn't. The surface wave is only one of the three types of mechanical waves: longitudinal, transverse and surface. Which one produces the biggest impact on the cone resonances? Not the surface wave! Besides, surface wave propagates along the interface between the two media - implicating large common areas (or whole cone area coating). Several dots on the large cone area will not change anything in the cone surface wave - by definition.
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Paper cone material is much thicker, so there is no good border. Also, area of the coating directly translates in the magnitude of influence, so several blobs are equal in influence as several specks of dust accidentally landed on the cone surface.
