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2. Public address system - Wikipedia

   en.wikipedia.org/wiki/Public_address_system

   During the late 1920s to mid-1930s, small portable PA systems and guitar combo amplifiers were fairly similar. These early amps had a "single volume control and one or two input jacks, field coil speakers" and thin wooden cabinets; remarkably, these early amps did not have tone controls or even an on-off switch. [14]

3. Keyboard amplifier - Wikipedia

   en.wikipedia.org/wiki/Keyboard_amplifier

   Powered PA speakers are speaker enclosures with a built-in power amplifier and, in some cases, other electronic components. In the 2010s, there is a convergence between the functionality of powered speakers and small PA systems, because some powered PA speakers include a small mixer, an XLR input for a microphone, and a microphone pre-amp ...

4. Watkins Electric Music - Wikipedia

   en.wikipedia.org/wiki/Watkins_Electric_Music

   In 1967-1968 The Who used the WEM (Watkins Electric Music) Audiomaster five-channel mixer and multiple WEM 100-watt transistor PA amplifiers chained together as their sound system. [4] In the concert movie Pink Floyd: Live at Pompeii (1972), the band is shown using WEM PA equipment as it performs in the ruins of an ancient amphitheatre in ...

5. Yorkville Sound - Wikipedia

   en.wikipedia.org/wiki/Yorkville_Sound

   The portable mixer-amplifier concept was a novel idea that quickly proved popular among musicians, and was the inspiration for the 1967 introduction of the competing "Vocal Master" product line by Shure. [15] In 1967, Yorkville expanded distribution westward to Vancouver and southward into the United States via Buffalo, New York. [15]

6. Audio power amplifier - Wikipedia

   en.wikipedia.org/wiki/Audio_power_amplifier

   Audio stereo power amplifier made by McIntosh The internal view of a Mission Cyrus 1 Hi Fi integrated audio amplifier (1984) [1]. An audio power amplifier (or power amp) amplifies low-power electronic audio signals, such as the signal from a radio receiver or an electric guitar pickup, to a level that is high enough for driving loudspeakers or headphones.

7. Sound reinforcement system - Wikipedia

   en.wikipedia.org/wiki/Sound_reinforcement_system

   Lightweight, portable speaker systems for small venues route the low-frequency parts of the music (electric bass, bass drum, etc.) to a powered subwoofer. Routing the low-frequency energy to a separate amplifier and subwoofer can substantially improve the bass response of the system.