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2. Powered speakers - Wikipedia

   en.wikipedia.org/wiki/Powered_speakers

   An active full-range loudspeaker. Powered speakers, also known as self-powered speakers and active speakers, are loudspeakers that have built-in amplifiers.Powered speakers are used in a range of settings, including in sound reinforcement systems (used at live music concerts), both for the main speakers facing the audience and the monitor speakers facing the performers; by DJs performing at ...

3. 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 ...

4. List of Bose home audio products - Wikipedia

   en.wikipedia.org/wiki/List_of_Bose_home_audio...

   The "3-2-1 GS" model was introduced in 2003, named for its use of Bose "Gemstones" small speakers, which have two drivers pointing forward and one pointing to the side. [2] [3] The 3-2-1 was replaced by the "321 Series II" in 2004, which included two small speakers and a subwoofer. [4]

5. Polk Audio - Wikipedia

   en.wikipedia.org/wiki/Polk_Audio

   The Monitor 12 was quite capable for its day, having bass response to 18 Hz, a free-air mounted tweeter, and 500-watt RMS power handling. Later Polk speaker models used arrays of drivers—Stereo Dimensional Array (SDA)—to cancel the crosstalk from the left speaker to the right ear and from the right speaker to the left ear, so as to expand ...

6. Soundbar - Wikipedia

   en.wikipedia.org/wiki/Soundbar

   It was a powered speaker system that offered stereo, Dolby Pro-Logic and AC3 surround sound from the soundbar and a separate subwoofer. The soundbar contained four 3-inch full range drivers and two 1-inch tweeters while the subwoofer housed one 8-inch dual voice coil driver.

7. 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 ...