A loudspeaker enclosure with variable directional effect for the middle - and high frequencies

摘要

Loudspeaker box, with a loudspeaker enclosure 1 (1), with a sound source 12 (8) and one of the sound source which is placed in front of hopper 2 (1), the opening angle α is variable, and in which the directional effect of the middle - and high frequencies, determined.