(57) A loudspeaker includes a high frequency transducer 13 and a low frequency transducer
14 mounted on a vertical baffle 12 forming the front of a cabinet 11, and having respective
virtual acoustic sources 1 and 3. Each unit receives an amplified signal through an
electrical filter to constitute a passive system, and a delay network is included
in the path of the amplified signal to the high frequency unit 13 so as to introduce
a delay such that the effective virtual acoustic source of the unit is displaced a
distance d1 to the right so as to lie in the same vertical plane as the virtual source
3. The acoustic radiation from the two units thus appears to emanate from points in
space situated in the same vertical plane, thereby avoiding time delay and phase distortions
over the reproduced frequency band.
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