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 This is why speakers that small are usually mounted in equally small enclosures (like the ear cups of old-school Koss headphones, for example) that are just stuffed with a little loose cotton.1.
#Labyrinth speaker enclosure design driver#
So there is no need to vent or horn-load the driver to smooth out the bass response.įurthermore, the bump in the response curve at, say, 7.5kHz can be managed simply by turning down the treble knob on the amp that is driving the little speaker.
This is a solved problem in the field and results in the so-called Theile-Small parameters for ported enclosures, which nearly everyone uses when designing hi-fi speakers.īut a tiny little 40mm speaker is going to have a response peak between 5 and 10kHz and except in the so-called near field (speaker is closer to your ear than one speaker diameter), that speaker is going to put out very, very small amounts of audible bass energy. The primary objective of full-sized speaker enclosure design is to manage the resonances of the box/driver system so as to prevent large response peaks in the bass range while extending bass response to the lowest frequencies possible.
However, here is why micro-enclosures don't get designed according to the same laws and equations used for full-sized speaker boxes: The equations scale linearly for the linear dimensions of enclosures.
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