Patent ID: 7088833

Claim:
Loudspeaker combination, comprising at least two loudspeakers ( 2 , 3 ), of which one ( 3 ) is preceded by a low-pass frequency filter ( 4 ) and the other ( 2 ) by a phase shifter ( 5 ), said at least two loudspeakers ( 2 , 3 ), one including at least one loudspeaker ( 3 ) that radiates low frequency tones and at least one other ( 2 ) loudspeaker that radiates low and at least medium frequency tones, said phase shifter ( 5 ) in front of said at least one other loudspeaker ( 2 ) radiating low as well as medium frequency tones being set such that said phase shifter 5 causes the low frequency tones emanating from said at least one other loudspeaker ( 2 ) to have substantially the same phase as the low frequency tones emanating from said at least one loudspeaker ( 3 ), whereby said low frequency tones emanating from said loudspeakers are substantially in phase with each other and reinforce each other to increase the volumes of said low frequency tones, thereby allowing smaller-sized loudspeakers for a desired volume output.