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2. 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.

3. List of speakers of the Pennsylvania House of Representatives

   en.wikipedia.org/wiki/List_of_Speakers_of_the...

   Wisdom, Vision and Diplomacy: Speakers of the Pennsylvania House (A Biographical History of the Speakers of the Provincial Assembly and the House of Representatives, 1682-1998). Harrisburg, PA: Pennsylvania House of Representatives. ISBN 978-0-9667794-0-0. OCLC 40553654. "Speakers of the Provincial Assembly (1682-1790) (page 14/28)" (PDF).

4. HH Electronics - Wikipedia

   en.wikipedia.org/wiki/HH_Electronics

   Many new PA speaker cabinets were designed and put into production, such as the 212 & 412 Dual Concentric, 212BL, 215BL, 412BL, 115PA Radial Horns and Bass Bin + Piezo plus the Concert Series of pro PA systems. A large range of studio and live mixing consoles, from an 8:2 to a 24:8:2, was designed and manufactured in the early 1980s, plus an HH ...

5. Wall of Sound (Grateful Dead) - Wikipedia

   en.wikipedia.org/wiki/Wall_of_Sound_(Grateful_Dead)

   Because each speaker carried just one instrument or vocalist, the sound was exceptionally clear and free of intermodulation distortion. [2] Several setups have been reported for The Wall of Sound: 604 total speakers, powered by 89 300-watt solid-state and three 350-watt vacuum tube amplifiers generating a total of 26,400 watts of power. [3]

6. Threshold Audio - Wikipedia

   en.wikipedia.org/wiki/Threshold_Audio

   Threshold Audio. Threshold Audio is a high-end audio equipment manufacturer originally established in California in 1974 by audio engineer Nelson Pass and graphic designer René Besne. The company, today based in Houston Texas, manufactures mono-block and stereo power amplifiers, multi-channel power amplifiers and stereo control amplifiers.

7. 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 ...