Acoustics 101 Pro Advanced Enclosure Design TUTORiAL
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Acoustic suspension or acoustic suspension systems are a type of loudspeaker enclosure that uses a sealed acoustic chamber to reduce resonances by absorbing incident sound waves. This is accomplished by using an acoustic absorber or absorbers, such as foam or wool, to fill the chamber. The absorber is typically attached to the interior walls of the sealed chamber so that standing sound waves will not produce resonant feedback from the absorber back into the enclosure. This method of damping sound waves is effective as long as the material is sufficiently rigid to damp the higher frequencies while not having too great an effect on the lower frequencies. In addition, to ensure that no acoustic vibrations are transferred from the enclosure to the absorber, the enclosure and absorber must be mechanically isolated from each other. The resulting isolation will be dependant on the type and quality of the materials used to manufacture the system. The acoustic suspension approach can be used for front- or rear-firing enclosures, and in theory, can be used with any enclosure type, but in practice is most commonly used in bass reflex and bass reflex/superpower enclosures. Many acoustic suspension subwoofers use both a bass reflex cabinet and an acoustic suspension system. Acoustic suspension systems are generally stronger and more efficient than bass reflex enclosures, and are most commonly used for live sound applications. Acoustic suspension systems are less common in desktop subwoofer enclosures, and are generally more expensive to produce than bass reflex enclosures. Acoustic suspension subwoofers are often more efficient than their bass reflex counterparts due to the use of more expensive materials and higher level of audio engineering. Acoustic suspension subwoofers are often used to produce the loudest subwoofers, including those for sound reinforcement systems, as well as for very large speakers such as those for staging systems.
Bass reflex cabinets are a subwoofer enclosure type that utilizes a ported or ported/vented enclosure that can be closed, single- ported, or double-ported. The enclosure is partially open or open at the rear and contains one or more passive radiator loudspeakers. The back of the enclosure has one or more ports (openings) that allow the low-frequency sound waves to pass into the rear and out the front of the enclosure, producing an omnidirectional low-frequency response pattern. This approach is similar to the operation of a bass reflex speaker with a folded horn.
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