Subwoofer structure and adjusting method

摘要

A subwoofer (10) structure comprised of a transducer (30) located in a loudspeaker enclosure (11), an acoustic duct (21) expanding in a horn-like manner, a frontal chamber (40) and an aperture (22). A sound wave emanating from the transducer is conveyed via the acoustic duct portion expanding in a horn-like manner to the frontal chamber, and a sound wave emanating from the opposite side of the transducer is conveyed either to a closed space (20) or directly to the frontal chamber. The subwoofer can be adjusted without altering the external dimensions of the loudspeaker enclosure, utilising the entire volume of the loudspeaker enclosure, so that the frontal chamber is tuned by altering the size of the frontal chamber and/or the size of the aperture in the frontal chamber.

主权项

1. A subwoofer comprising a loudspeaker enclosure formed by front and back walls, side walls, and top and bottom walls; a transducer having a cone side and a magnet side and being attached to a transducer fixture plate provided in the loudspeaker enclosure; a horn-like, expanding acoustic duct starting from the transducer; and an aperture formed in a front wall of the loudspeaker enclosure through which a sound wave generated by the transducer and conveyed by the expanding acoustic duct to the aperture is conveyed out of the loudspeaker enclosure,
the subwoofer having a rectangular structure such that walls of the loudspeaker enclosure and walls of the expanding acoustic duct form rectangular structures, and the cross-sectional area of the expanding acoustic duct changes in steps and the direction of the acoustic duct makes a 90° or a 180° turn at the location of a change, and wherein the subwoofer includes a frontal chamber for tuning the subwoofer to a required frequency range and/or increasing a sound pressure level of the subwoofer, the frontal chamber being arranged in a front portion of the subwoofer such that the frontal chamber is the last portion of the expanding acoustic duct close to the aperture, and the frontal chamber has walls of rectangular structure and is a decreased cross-section of the expanding acoustic duct formed by the aperture having a decreased cross-sectional area relative to that of the expanding acoustic duct adjacent the aperture such that the expanding acoustic duct is choked.