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2. Constant-voltage speaker system - Wikipedia

   en.wikipedia.org/wiki/Constant-voltage_speaker...

   Loudspeaker with attached step-down transformer for use on a constant-voltage system. Constant-voltage speaker systems refer to networks of loudspeakers which are connected to an audio amplifier using step-up and step-down transformers to simplify impedance calculations and to minimize power loss over the speaker cables.

3. Public address system - Wikipedia

   en.wikipedia.org/wiki/Public_address_system

   PA over IP refers to PA paging and intercom systems that use an Internet Protocol (IP) network, instead of a central amplifier, to distribute the audio signal to paging locations across a building or campus, or anywhere else in the reach of the IP network, including the Internet. Network-attached amplifiers and intercom units are used to ...

4. Harman Kardon - Wikipedia

   en.wikipedia.org/wiki/Harman_Kardon

   Bogen was not interested so Harman resigned in 1953, [3] taking his boss, Bogen's chief designer Bernard Kardon (January 8, 1914 – April 14, 1993) with him. Naming their new company Harman/Kardon Inc., [ 4 ] each invested $5,000 (equivalent to $56,940 in 2023) in capital and opened a production facility in Westbury, New York.

5. Radio-paging code No. 1 - Wikipedia

   en.wikipedia.org/wiki/Radio-paging_code_No._1

   Radio-paging code No. 1 (usually and hereafter called POCSAG) is an asynchronous protocol used to transmit data to pagers. Its usual designation is an acronym of the P ost O ffice C ode S tandardisation A dvisory G roup, the name of the group that developed the code under the chairmanship of the British Post Office that used to operate most ...

6. Sinclair Radionics - Wikipedia

   en.wikipedia.org/wiki/Sinclair_Radionics

   Another Sinclair Radionics product that was introduced in 1964 and failed was the first class D amplifier kit rated at 10 watt RMS: [citation needed] a class D switching amplifier that was good in theory but sadly ahead of its time and available technology. The amplifier used low-frequency germanium transistors as pulse width modulators and ...

7. List of Ambisonic hardware - Wikipedia

   en.wikipedia.org/wiki/List_of_Ambisonic_hardware

   A popular and unfortunate misconception is that Ambisonic recordings can only be made with the SFM, and as a result there is a widespread, and erroneous, belief that Ambisonics can only be used to capture a live acoustic event (something that accounts for a tiny proportion of modern commercial recordings, the vast majority of which are built up in the studio and mixed from multitrack).