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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. Audio power - Wikipedia

   en.wikipedia.org/wiki/Audio_power

   Audio power is the electrical power transferred from an audio amplifier to a loudspeaker, measured in watts. The electrical power delivered to the loudspeaker, together with its efficiency , determines the sound power generated (with the rest of the electrical power being converted to heat).

5. List of Bose home audio products - Wikipedia

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

   The first 2.1 audio system from Bose to include a DVD player was the "3-2-1", released in 2001. [1] 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]

6. Constant-voltage speaker system - Wikipedia

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

   The voltage is constant only in the sense that at full power, the voltage in the system does not depend on the number of speakers driven (as long the amplifier's maximum power is not exceeded). [2] Constant-voltage speaker systems are also commonly referred to as 25- , 70- , 70.7- , 100 or 210-volt speaker systems ; distributed speaker systems ...

7. Surround sound - Wikipedia

   en.wikipedia.org/wiki/Surround_sound

   In the original movie theater implementation, the LFE was a separate channel fed to one or more subwoofers. Home replay systems, however, may not have a separate subwoofer, so modern home surround decoders and systems often include a bass management system that allows bass on any channel (main or LFE) to be fed only to the loudspeakers that can ...