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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 ...
Schematic of active absorption. The bass signal is shown as a transversal wave. The frontal wave is reflected at the back wall. At the same time the back array sends out an inverted wave which cancels the reflection. Due to the specific grid layout of the subwoofer array most modal effects are suppressed.
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 ...
As a result, good subwoofers are typically quite heavy. 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]
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.
Loudspeaker enclosures range in size from small "bookshelf" speaker cabinets with 4-inch (10 cm) woofers and small tweeters designed for listening to music with a hi-fi system in a private home to huge, heavy subwoofer enclosures with multiple 18-inch (46 cm) or even 21-inch (53 cm) speakers in huge enclosures which are designed for use in ...
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