EP 0456416 B1 19950802 - Loudspeaker system.
Title (en)
Loudspeaker system.
Title (de)
Lautsprechersystem.
Title (fr)
Système de haut-parleur.
Publication
Application
Priority
JP 12162590 A 19900511
Abstract (en)
[origin: EP0456416A2] A dip-free plane flat pressure level-frequency characteristic is realized by a cascade bass-reflex loudspeaker system provided with a port-containing partition or partitions in a speaker cabinet to divide a space inside thereof into two internal acoustically connected spaces by establishing in either internal space a Helmholtz resonator possessing the same resonant frequency as a second antiresonant frequency to absorb a negative-phase sound radiated from the port to the outside of the cabinet, thereby eliminating a dip in the sound pressure-level frequency characteristic due to the second antiresonance unique to a cascade bass-reflex loudspeaker system. <IMAGE>
IPC 1-7
IPC 8 full level
H04R 1/28 (2006.01)
CPC (source: EP)
H04R 1/2819 (2013.01); H04R 1/2826 (2013.01)
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 0456416 A2 19911113; EP 0456416 A3 19921125; EP 0456416 B1 19950802; DE 69111683 D1 19950907; DE 69111683 T2 19960404; JP 2653219 B2 19970917; JP H0417497 A 19920122
DOCDB simple family (application)
EP 91303981 A 19910502; DE 69111683 T 19910502; JP 12162590 A 19900511