A free-air system consists of woofers mounted to a board attached to the rear
deck or placed in the trunk against the rear seat. The trunk of the car acts as an
enclosure which houses the subwoofer and isolates sound from the back of the speaker,
solving the sound cancellation problem of subs without an enclosure. Free-air subs are also often used for marine applications.
Free-air systems save space and have flat frequency response. The woofer must be specifically
designed for free-air use. The lack of a box makes them more convenient to install, but their power
handling levels are usually much lower than their boxed counterparts.
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