| 摘要 |
PROBLEM TO BE SOLVED: To provide an enclosure (casing) having acoustic effects of comfort in listening, especially, for a speaker system in high-fidelity stereo sound field reproduction.SOLUTION: The enclosure (casing) is formed from a cylindrical paper tube and a plurality of doughnut-shaped corrugated cardboard, and the inside includes two speaker units. For the details of properties of an acoustic filter, attention is paid onto the point that regular porous bodies in a flute (wavelet) structure that the corrugated cardboard of a foundation material has are conform to an acoustic filter. More specifically, the enclosure is improved in moldability, its pore diameter or porosity is 90% or more and standing waves generated from unwanted vibrations caused by permeability (vibration attenuation property) of air (sonic waves) and its vibration adjustment property are suppressed.SELECTED DRAWING: Figure 1 |
