Loudspeaker system
US4504704A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 1983 |
| Grant date | Mar 12, 1985 |
| Priority date | — |
| Expiry date | Aug 30, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2209/041
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A dynamic loudspeaker unit having a voice coil formed with two windings in which a capacitor is connected in series to a parallel circuit, one circuit arm being composed of a series circuit of one of the two windings and an inductor and the other circuit arm being composed of the remaining winding. The dynamic loudspeaker unit thus constructed is housed in a bass-reflex type cabinet, whereby a shoulder characteristic having a large Q in a bass zone can be obtained, and due to a combination of the inductor and the capacitor, a desired lowest resonance frequency lower than an actual lowest resonance frequency can be selected. Thus, the reproducible bass range can be extended.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.