Subwoofer speaker system
US5147986A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1990 |
| Grant date | Sep 15, 1992 |
| Priority date | — |
| Expiry date | Dec 3, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/2819
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A subwoofer system for providing acoustic energy is provided. The subwoofer or full-range speaker enclosure is divided into at least three chambers. A first speaker acoustically couples the first chamber with the third chamber. A second speaker acoustically couples the second chamber with the third chamber. A first port acoustically couples the first chamber to the exterior of the enclosure. A second port acoustically couples the second chamber to either the first chamber or the exterior of the enclosure. The speakers are driven out-of-phase with respect to the third chamber so as to maintain the third chamber in a substantially constant-pressure state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.