The larger voice coils have lower frequency response and resonance points, where documented. That obviously changes once mounted. Reverb is primarily low frequency in nature, so low handling seems important. The unit you pointed out does not go terribly low on paper, but the response is listed for bone conduction. The plate will have it's own resonance point, like any vibrated surface, to interact with the driver itself. One conflicting difference between these and the typical reverb driver is the surface area these larger drivers use, which I imagine would tend to damp the plate. The tapering drive cone that attaches to the Ecoplates I have minimizes the contact point relative to the actual VC diameter.
