Electrodynamic emitter - Diaphragm assembly
Diaphragm assembly (in an electrodynamic emitter)
An integral assembly comprising the diaphragm, moving coil, coil former, diaphragm suspension and attachments for mounting the assembly in the emitter.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM