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A DBA requires at least two subwoofers (preferably same make and model) that are placed at opposing walls in a specific layout. The signal played by the subwoofer array on the back wall is inverted and delayed based on the distance to the frontal subwoofer array. This will actively "absorb" any reflected sound.
This approach takes into account the natural low-frequency responses of the main speakers, which roll off at 12 dB/octave for sealed enclosures, and 18–24 dB/octave for vented enclosures. The aim is to have the low-pass filtered and high-pass filtered signals be −6 dB at the crossover frequency, producing what is known as an acoustical 4th ...
Velodyne Acoustics GmbH, commonly known as Velodyne, is a company that makes subwoofers and related products and was originally founded by David Hall in Silicon Valley, California, in 1983 and was then purchased in 2019 by Audio Reference of Hamburg, Germany, and its owner Mansour Mamaghani.
Bi-amping - An active crossover with two amplifiers.. Bi-amping and tri-amping is the practice of using two or three audio amplifiers respectively to amplify different audio frequency ranges, with the amplified signals being routed to different speaker drivers, such as woofers, subwoofers and tweeters.
An isobaric loudspeaker is a loudspeaker in which two or more identical woofers (bass drivers) operate simultaneously, with a common body of enclosed air adjoining one side of each diaphragm. They are most often used to improve low-end frequency response without increasing cabinet size, though at the expense of cost and weight.
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The two channels of a stereo amplifier are fed the same monaural audio signal, with one channel's electrical polarity reversed. A loudspeaker is connected between the two amplifier outputs, bridging the output terminals. This doubles the available voltage swing at the load compared with the same amplifier used without bridging.
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