on a musical instrument that is not made louder by electrical equipment:
Acoustic coupler
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An [old-fashioned] telecommunications device that makes digitally-encoded sounds to be received and interpreted through a telephone handset. The acoustic coupler had two rubber cups that [fitted] the [mouthpiece] and earpiece of an old-fashioned phone receiver.
A person who makes a lot of noise during sex.
Acoustic coupler meaning & definition 1 of Acoustic coupler.
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