A loudspeaker enclosure, for a loudspeaker with a diaphragm, having a front wall, a mounting and spacing device for mounting the loudspeaker spaced from the front wall, and an aperture defined in the front wall which is substantially smaller than the diaphragm. The enclosure can include an elliptical...http://www.google.fr/patents/US4679651?utm_source=gb-gplus-shareBrevet US4679651 - Loudspeaker enclosure
