In-ground audio sub woofer and method of installation
US8873788B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Aug 29, 2011 |
| Grant date | Oct 28, 2014 |
| Priority date | — |
| Expiry date | Mar 12, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/2811
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A sub woofer for in-ground installation and a method of installation. The sub woofer has a cylindrical enclosure or housing having a driver, electronics and a band pass filter. The driver cone is coaxial with the axis of the cylindrical housing. A port tube assembly having a tuned port tube and a resilient elbow interface is attached to an end wall of the housing in an eccentric position with the port tube projecting vertically and terminating at a canopy. The installation requires placing the enclosure in an excavation and positioning the housing and port assembly so a predetermined above ground spacing exists between the upper end of the above ground port tube and grade.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.