The Labyrinth Enclosure is named after the transmission line of classical electrical theory. The sound tube made of sound-absorbing wall is provided behind the speaker, and its length is 1/4 or 1/8 of the wavelength of the desired low-frequency sound. . Theoretically it attenuates the sound waves coming from behind the cone, preventing it from reflecting to the open end and affecting the acoustic radiation of the woofer, but in fact the transmission line speaker has a slight damping and tuning effect, increasing the speaker near or below the resonance frequency. Acoustic output and reduce the amount of stroke while enhancing the bass output. Usually, the sound tubes of such speakers are mostly labyrinth-like, so they are also called labyrinth or labyrinth.
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