Patent ID: 7284637

Claim:
A low-frequency sound reproducing speaker apparatus of a Kelton type connected to a vehicle mounted acoustic system as a subwoofer, comprising: a speaker unit; a first air chamber for hermetically sealing a rear face of the speaker unit; a second air chamber for surrounding a front face of the speaker unit; a cabinet which is partitioned into the first air chamber and the second air chamber by a partition plate attached with the speaker unit; and a duct and a port for emitting low-frequency sound of a specific frequency band in a sound wave generated at inside of the second air chamber by the speaker unit which are mounted with a cabinet wall forming the second air chamber, wherein: the cabinet is constituted by a shape of substantially a parallelepiped slender in a front and rear direction, a length dimension in the front and rear direction is set to a value substantially near to a depth dimension of a seat cushion of a vehicle, and a front face wall thereof is mounted with the duct and the port; the partition plate supports the front face of the speaker unit to direct sound towards a side of a front face of the cabinet; the cabinet is fixed to the seat cushion by binding a fixing belt laid at a lower face of the cabinet along the front and rear direction to the seat cushion; and the cabinet is formed to be divided upward and downward into a lower case on a lower face of which the fixing belt is attachably and detachably attached and an upper case for covering the lower case, and the upper case and the lower case are mounted with connecting stays for supporting a load in an up and down direction by butting to connect front ends to each other to cross center portions of the respective air chambers.