Patent ID: 8028792

Claim:
A speaker apparatus comprising a phase inversion-type enclosure in which a speaker unit and a bass reflex port are installed, the bass reflex port having a tubular body whose hollow cross-sectional area gradually becomes smaller from one opening side toward an inside of the bass reflex port in an axial direction of the bass reflex port, a length in one direction of the hollow cross section of the tubular body being not changing and constant along the axial direction of the bass reflex port, a length in other direction of the hollow cross section of the tubular body being changing along the axial direction of the bass reflex port, and the one direction being perpendicular to both the other direction and to the axial direction of the bass reflex port; wherein, a predetermined length portion of the tubular body portion along the axial direction of the bass reflex port at a location at which the hollow cross-sectional area is smallest is a main tubular portion in which the hollow cross-sectional area is constant, a portion of the tubular body portion that connects to at least one end of the main tubular portion and in which the hollow cross-sectional area gradually increases from a side that connects to the main tubular portion toward the opening end of the bass reflex port is an air rectifier, the speaker unit is provided at a first end of the enclosure in an axial direction of the enclosure, a first opening portion of the bass reflex port is provided directly under the speaker unit in the axial direction of the bass reflex port, a second opening portion of the bass reflex port is provided at a second end of the enclosure in the axial direction of the enclosure, the first and second ends of the enclosure are opposite to each other with respect to the axial direction of the enclosure, and the second opening portion of the bass reflex port is provided in a direction different from an axial direction of the air rectifier.