Subject matter wherein the sounds are produced by the vibration of at least two diaphragms or by the vibration of a diaphragm and a resonator disc or plate secured to the diaphragm.
(the sounds; are produced; by the vibration of at least two diaphragms or by the vibration of a diaphragm and a resonator disc or plate) (a resonator disc or plate; secured; to the diaphragm)
the sounds a resonator disc or plate
are produced secured
by the vibration of at least two diaphragms or by the vibration of a diaphragm and a resonator disc or plate
to the diaphragm