Subject matter wherein two or more diaphragms are driven by the same mechanism, or arranged so that the sound waves produced by one cause the other to vibrate.
(two or more diaphragms; arranged; so that the sound waves produced by one cause the other to vibrate) (the sound waves; produced; by one cause the other to vibrate) (the other; to vibrate; )
two or more diaphragms the sound waves the other
arranged produced to vibrate
so that the sound waves produced by one cause the other to vibrate
by one cause the other to vibrate