Patent ID: 9571934
Date: 2017-02-14
CPC Classifications: H04R

Claim:
1. An acoustic device, comprising: an enclosure; a first passive radiator structure comprising a first vibrating portion that comprises a first passive radiator diaphragm, wherein the first passive radiator structure is mounted to the enclosure such that the first vibrating portion can vibrate relative to the enclosure, and wherein the first vibrating portion has a first effective radiating area and a first mass; a second passive radiator structure comprising a second vibrating portion comprising a second passive radiator diaphragm, wherein the second passive radiator structure is mounted to the enclosure such that the second vibrating portion can vibrate relative to the enclosure, and wherein the second vibrating portion has substantially the same effective radiating area as the first effective radiating area; wherein the second vibrating portion further comprises at least one active electro-acoustic transducer mounted to the second passive radiator diaphragm such that the at least one active electro-acoustic transducer moves when the second passive radiator diaphragm vibrates; wherein the second vibrating portion has a second mass that is greater than the first mass, and; wherein pressure changes within the enclosure generated by the active electroacoustic transducer apply first and second forces to the first and second vibrating portions respectively wherein the first and second forces are balanced.