Loudspeaker diaphragms support distributed resonances beyond lumped-element models

Evidence

Not all resonances are of the lumped element variety. They can occur in the radial and circumferential wave motion in loudspeaker diaphragms (and wine glasses). When reflections from the edge surrounds reinforce the incoming waves from the voice coil, there is an aberration in the frequency response. — Toole, Floyd E, Sound reproduction- the acoustics and…, 493