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2. Subwoofer - Wikipedia

   en.wikipedia.org/wiki/Subwoofer

   Subwoofers are never used alone, as they are intended to substitute the VLF sounds of "main" loudspeakers that cover the higher frequency bands. VLF and higher-frequency signals are sent separately to the subwoofer(s) and the mains by a "crossover" network, typically using active electronics, including digital signal processing (DSP ...

3. 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 ...

4. Loudspeaker - Wikipedia

   en.wikipedia.org/wiki/Loudspeaker

   Many subwoofer systems include integrated power amplifiers and electronic subsonic-filters, with additional controls relevant to low-frequency reproduction (e.g. a crossover knob and a phase switch). These variants are known as active or powered subwoofers. [29] In contrast, passive subwoofers require external amplification.

5. Passive radiator (speaker) - Wikipedia

   en.wikipedia.org/wiki/Passive_radiator_(speaker)

   A speaker enclosure using a passive radiator usually contains an "active loudspeaker" (or main driver), and a passive radiator (also known as a "drone cone"). The active loudspeaker is a normal driver, and the passive radiator is of similar construction, but without a voice coil and magnet assembly.

6. Genelec - Wikipedia

   en.wikipedia.org/wiki/Genelec

   Genelec active subwoofers: 7050B, 7060B, 7070B. Genelec has exported speakers from their beginning, and has increased exports over the years. In 1980, they exported 20% of production, in 1984 80%, and on into the 1990s exports peaked at 95% but have settled to around 90% in the 2000s.

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