Patent ID: 8031897
Filing Date: 2011-10-04
Classification: H04R

Abstract:
1. An apparatus comprising: a first electro-acoustic transducer having a first diaphragm, the first diaphragm characterized by a first axis defining a movement of the first diaphragm; a second electro-acoustic transducer having a second diaphragm, the second diaphragm characterized by a second axis defining a movement of the second diaphragm; and a housing supporting the first and second electro-acoustic transducers, the housing maintaining the first axis in a predetermined, non-colinear, orientation relative to the second axis, wherein a vector sum of an inertial force generated by the first diaphragm, an inertial force generated by the second diaphragm and an acoustic force is substantially zero, a first component of the inertial force generated by the first diaphragm and a first component of the inertial force generated by the second diaphragm are balanced by the acoustic force, and a second component of the inertial force generated by the first diaphragm is balanced by a second component of the inertial force generated by the second diaphragm, the first components of the inertial forces generated by the first and second diaphragms and the balancing acoustic force all being orthogonal to the second components of the inertial forces generated by the first and second diaphragms.