In many systems, the inherent resonant frequency of the speaker and the enclosure with which it is combined function to produce "booming" or unnatural emphasis of bass tones of particular frequencies, while de-emphasizing other frequencies. The problem is most acute for lower frequency sounds, otherwise known as bass sounds and most speaker systems fail to faithfully reproduce such bass sounds. In the field of high fidelity music reproduction systems, substantial and continuous efforts are being made to obtain sound reproduction which is as faithful as possible to the original sounds to be reproduced by the high fidelity system. The combination according to claim 6 wherein said shell has a hollow spherical interior. The combination according to claim 6 wherein said shell is made of polyurethane foam.Ĩ. Where M is the distance between the limits of mechanical excursion of the diaphragm of said loudspeaker and D is the diameter of the loudspeaker and an outer cabinet around said shell providing structural rigidity to the combination and having a shape independent of the shape of the interior of said shell.ħ. An enclosure and loudspeaker combination comprising a molded foamed plastic shell made of foamed plastic having a discrete closed cellular structure of a density in the range of two to four pounds per cubic foot and having a hollow interior, each cross section of which is a continuous closed curve, and having an aperture therethrough for mounting a loudspeaker of complementary dimensions to the dimensions of such aperture and means for attaching said loudspeaker in said aperture to seal said aperture where the volume V of the interior of said shell is determined according to the formula: V= 3 The combination according to claim 4 wherein said foamed plastic shell is made of polyurethane foam.Ħ. The combination according to claim 1 wherein said foamed plastic shell is formed of foamed plastic having a discrete closed cellular structure of a density in the range of two to four pounds per cubic foot.ĥ. An enclosure and loudspeaker combination according to claim 1 wherein said molded shell has a hollow spherical interior.Ĥ. An enclosure and loudspeaker combination according to claim 1 further including an outer cabinet wherein said molded foamed plastic shell is within said outer cabinet, so that said outer cabinet provides structural rigidity to said combination and is of a shape independent of the shape of the interior of said foamed plastic shell.ģ. Where M is the distance between the limits of the mechanical excursion of the diaphram of said loudspeaker and D is the diameter of the loudspeaker so that pressure changes caused by excursions of the diaphram of said loudspeaker are equalized on the interior of said shell.Ģ.
An enclosure and loudspeaker combination comprising a molded foamed plastic shell having a hollow interior, the inner surface of which is porous and each cross section of which is a continuous curve, and having an aperture therethrough for mounting a loudspeaker of complementary dimensions to the dimensions of such aperture and means for attaching said loudspeaker in said aperture to seal said aperture the diameter of said loudspeaker and its limits of mechanical excursion being matched to the volume V of the interior of said shell according to the formula: V= 3
#90° speaker enclosure design professional#
The EMS-81X requires a single amplifier channel, and should be used with professional power amplifiers capable of delivering 400-500W RMS into an 8-ohm load. For optimum results, the EM Acoustics DQ Series Advanced System Amplifiers should be used.1. A flush handle, 35mm polemount socket and various threaded fixings are provided in the enclosure for optional rigging hardware. The front of the loudspeaker is protected by a rigid steel grille backed with acoustically transparent fabric. Two NL4 connections are provided on the rear for input and enclosure link. The robust enclosure is constructed from premium multi-laminate Birch plywood and is finished in a rugged black textured polyurethane or white textured paint as standard, though RAL colour matching and weather-protected outdoor options are available. The multi-angle enclosure along with the rotatable HF waveguide allows use in both horizontal and vertical orientations, as well as use as a compact stage monitor. The HF drive unit is coupled to a constant-directivity waveguide, which produces a 90° x 60° dispersion pattern which can be easily rotated if required. The enclosure contains an 8” (203mm) LF drive unit, linked via the internal passive crossover network to a 1.7” (44mm) diaphragm, 1” (25mm) exit HF compression drive unit.