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2. Intercom - Wikipedia

   en.wikipedia.org/wiki/Intercom

   1980s MirTone intercom system. An intercom, also called an intercommunication device, intercommunicator, or interphone, is a stand-alone voice communications system for use within a building, small collection of buildings or portably within a small coverage area, which functions independently of the public telephone network. [1]

3. Voice-operated switch - Wikipedia

   en.wikipedia.org/wiki/Voice-operated_switch

   Intercom systems that use a speaker in a room as both a speaker and a microphone will often use VOX on the main console to switch the audio direction during a conversation. The circuit usually includes a delay between the sound stopping and switching direction, to avoid the circuit turning off during short pauses in speech.

4. Talkback (recording) - Wikipedia

   en.wikipedia.org/wiki/Talkback_(recording)

   A talkback microphone in a recording studio. In sound recording, a talkback system is the intercom used in recording studios and production control rooms (PCRs) in television studios to enable personnel to communicate with people in the recording area or booth.

5. List of Bose home audio products - Wikipedia

   en.wikipedia.org/wiki/List_of_Bose_home_audio...

   The "2201" was released in 1966 and was Bose's first speaker system. [20] It consisted of 22 five-inch drivers and was designed to be located in the corner of a room, using reflections off the walls and floor to disperse the sound. [21] The system included tone controls and a switch to attenuate frequencies below 50 Hz.

6. Home audio - Wikipedia

   en.wikipedia.org/wiki/Home_audio

   The term music centre came into common use when all-in-one integrated systems, also known as shelf stereos or mini component systems, became popular. "Midi"-style systems (mimicking the appearance of a stacked component-based system) were popular during the 1980s. These typically included a record deck, tuner, dual cassette deck, amplifier and ...

7. Multi-room audio - Wikipedia

   en.wikipedia.org/wiki/Multi-room_audio

   Multi-room audio (distributed audio) systems are audio systems that allow for playback and often control of music throughout an entire home or building. Numerous commercial systems provide this function, or a system can be custom built or homemade.