Patent ID: RE39330

Claim:
A speaker system for a speaker comprising , ; a cabinet formed of an acoustic isolation wall walls , and having a maximum length L among width, depth and height of an inside of the cabinet , ; a sound source to generate standing waves inside the cabinet , ; and at least one partition wall situated inside the cabinet to form a space by surrounding the space, said partition wall suppressing the standing waves, a least a part of said partition wall being formed of a material which has high internal loss and a density per volume greater than 0.1 g/cm 3 , and a closed end portion surrounding the space, said closed end portion being formed of at least one of the partition wall and the acoustic isolation walls, walls; wherein said material has a density per area from 0.01 g/cm 2 to 0.21 g/cm 2 and a characteristic of semi-transmission for at least two kinds of standing waves of wavelengths of the length L and twice of said length L among the standing waves, said space is a substantially closed space, and a surface of said partition wall directed toward the sound source is substantially flat and uninterrupt uninterrupted by any protrusion which reflects said two kinds of standing waves .