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2. Powered speakers - Wikipedia

   en.wikipedia.org/wiki/Powered_speakers

   Some of the first powered loudspeakers were JBL monitor speakers. With the addition of the SE401 Stereo Energizer, introduced in 1964, any pair of monitor speakers could be converted to self-powered operation with the second speaker powered by the first. [8] The first studio monitor with an active crossover was the OY invented 1967 by Klein-Hummel.

3. JBL - Wikipedia

   en.wikipedia.org/wiki/JBL

   1946 – JBL creates the original 'JBL signature' logo with an exclamation (!) in black and white. Designed by Jerome Gould [11] 1946 – Lansing leaves Altec and founded a new company, James B. Lansing Sound Inc. 1947 – JBL has a 15" speaker (38 cm), model D-130, using for the first time a 4" (100 mm) voice coil in a speaker cone; 1949 ...

4. List of loudspeaker manufacturers - Wikipedia

   en.wikipedia.org/wiki/List_of_loudspeaker...

   JBL: United States Jensen: United States JL Audio: United States JVC: Japan K-array: Italy KEF: United Kingdom (brand) Kenwood: Japan Kharma International: Netherlands KLH: United States Klipsch: United States Krell Industries: United States KRK: United States Kustom: United States L-Acoustics: France Legacy Audio: United States Linn: United ...

5. JL Audio - Wikipedia

   en.wikipedia.org/wiki/JL_Audio

   The final edition of the W6 line of subwoofers is launched, named W6AE (Anniversary Edition). The original W1 subwoofers are discontinued after 11 years of production. JL Audio acquires Total Mobile Audio as an entry-level line to its dealers. [4] In 2004, JL Audio enters the home audio market with the Fathom and Gotham powered subwoofer ...

6. Subwoofer - Wikipedia

   en.wikipedia.org/wiki/Subwoofer

   From about 1900 to the 1950s, the "lowest frequency in practical use" in recordings, broadcasting and music playback was 100 Hz. [9] When sound was developed for motion pictures, the basic RCA sound system was a single 8-inch (20 cm) speaker mounted in straight horn, an approach which was deemed unsatisfactory by Hollywood decisionmakers, who hired Western Electric engineers to develop a ...

7. Sound reinforcement system - Wikipedia

   en.wikipedia.org/wiki/Sound_reinforcement_system

   Low-frequency signals are sent to amplifiers and then to subwoofers, and middle and high-frequency sounds are typically sent to amplifiers which power full-range speaker cabinets. Using a crossover to separate the sound into low, middle and high frequencies can lead to a "cleaner", clearer sound (see bi-amplification ) than routing all of the ...