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2. Intercom - Wikipedia

   en.wikipedia.org/wiki/Intercom

   May be rack-mounted, wall-mounted or portable. Wall mount station: Fixed-position intercom station with built-in loudspeaker. May have flush-mounted microphone, hand-held push to talk microphone or telephone-style handset. Belt pack: Portable intercom station worn on the belt such as an interruptible feedback (IFB) with an earpiece worn by talent.

3. Boundary microphone - Wikipedia

   en.wikipedia.org/wiki/Boundary_microphone

   Boundary microphone (Audio-Technica ATM87R) A boundary microphone (or pressure zone microphone) is one or more small omnidirectional or cardioid condenser mic capsule(s) positioned near or flush with a boundary (surface) such as a floor, table, or wall. The capsule(s) is/are typically mounted in a flat plate or housing.

4. Public address system - Wikipedia

   en.wikipedia.org/wiki/Public_address_system

   A public address system (or PA system) is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. It increases the apparent volume (loudness) of a human voice, musical instrument, or other acoustic sound source or recorded sound or music.

5. Wireless microphone - Wikipedia

   en.wikipedia.org/wiki/Wireless_microphone

   For large complex multi channel radio microphone systems, as used in broadcast television studios and musical theater productions, modular receiver systems with several (commonly six or eight) true diversity receivers slotting into a rack-mounted mainframe housing are available. Several mainframes may be used together in a rack to supply the ...

6. Isolation cabinet (guitar) - Wikipedia

   en.wikipedia.org/wiki/Isolation_cabinet_(guitar)

   To reduce volume on stage while staying near to a traditional guitar amp setup, a guitar amp can drive two parallel loads: a power attenuator driving a conventional guitar speaker cabinet (with no microphone), and a speaker isolation cabinet providing the signal for the mixer board and sound reinforcement system.

7. Acoustic mirror - Wikipedia

   en.wikipedia.org/wiki/Acoustic_mirror

   The pipe which held the "collector head" (microphone) can be seen in front of the structure. An acoustic mirror is a passive device used to reflect and focus (concentrate) sound waves . Parabolic acoustic mirrors are widely used in parabolic microphones to pick up sound from great distances, employed in surveillance and reporting of outdoor ...