| 摘要 |
<p>An enclosure (110) for an acoustic driver (120) includes walls with a first layer (112) having first acoustic impedance, a second layer (III) having second acoustic impedance, and at least one spacing element (113) intermediate to and coupling first and second layers. The first and second layers and the spacing element cooperate to absorb acoustic energy at mid to high audio frequencies. A limp wall (311, 312) placed behind the acoustic driver tends to augment low frequency acoustic energy from the speaker by moving with the driver in a coupled fashion. It also dampens transmission of mid to high frequency acoustic waves. Use of these structures allows high fidelity enclosures to be formed. The structures allow use of acoustically unsuitable materials such as sheet metal, wallboard or plastic for loudspeaker enclosures, and fabrication of such enclosures in shapes and sizes, that normally cannot achieve good acoustic performance.</p> |
