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  2. Constant-voltage speaker system - Wikipedia

    en.wikipedia.org/.../Constant-voltage_speaker_system

    Constant-voltage speaker systems are also commonly referred to as 25-, 70-, 70.7-, 100 or 210-volt speaker systems; distributed speaker systems; or high-impedance speaker systems. In Canada and the US, they are most commonly referred to as 70-volt speakers. In Europe, the 100 V system is the most widespread, with amplifier and speaker products ...

  3. Phantom power - Wikipedia

    en.wikipedia.org/wiki/Phantom_Power

    Norwegian Radio had requested phantom-powered operation. Since NRK already had 48-volt power available in their studios for their emergency lighting systems, this voltage was used for powering the new microphones (model KM 84), and is the origin of 48-volt phantom power. This arrangement was later standardized in DIN 45596.

  4. List of car audio manufacturers and brands - Wikipedia

    en.wikipedia.org/wiki/List_of_car_audio...

    This list of car audio manufacturers and brands comprises brand labels and manufacturers of both original equipment manufacturer (OEM) and after-market products generally related to in-car entertainment that already have articles within Wikipedia. While components sold by these companies have much in common with other audio applications or may ...

  5. List of vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_vacuum_tubes

    4.8 12 volt heater tubes. ... The system was used in 1942–44 and assigned ... used as a Class-A audio driver or a Class-B audio output. U7B base. 6.3 volt heater ...

  6. Vehicle audio - Wikipedia

    en.wikipedia.org/wiki/Vehicle_audio

    Mobile players for physical media have been provided for vinyl records, 8-track tapes, cassette tapes, compact discs, and MP3s.The increased sophistication of the vehicle audio system to accommodate such media has made the audio unit a common target of car break-ins, so these are equipped with anti-theft systems too.

  7. Public address system - Wikipedia

    en.wikipedia.org/wiki/Public_address_system

    A sound source such as a compact disc player or radio may be connected to a PA system so that music can be played through the system. Smaller, battery-powered 12 volt systems may be installed in vehicles such as tour buses or school buses, so that the tour guide and/or driver can speak to all the passengers.

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