Patent ID: 6028947
Filing Date: 2000-02-22
Classification: H04R

Abstract:
A waveguide device for an acoustic speaker having a predetermined cone weight, which comprises:a waveguide body having a speaker end and an open end and having a plurality of segments, said segments being substantially similar to one another, there being an even number of segments from four to twenty each of said segments having a flat surface in a plane parallel to said speaker end, each of said segments having inside wall surfaces which flare increasingly outwardly from said speaker, and wherein each of said segments' inside wall surfaces has a speaker end length, L.sub.1, which is within the range determined by the following formulas:L.sub.1 minimum=0.7.times.w.sub.s /0.0012 g/cm.sup.3 .times.1/A.sub.SEandL.sub.1 maximum=1.2.times.w.sub.s /0.0012 g/cm.sup.3 .times.1/A.sub.SEwherein L.sub.1 is a straight line length of the lower portion of the segment wall surface, referred to as the speaker end length, w.sub.s is the weight of a speaker cone in grams/cm.sup.3, and A.sub.SE is the cross-sectional area of the speaker end in square centimeters;further wherein each of said segment inside wall surfaces have an outer length L.sub.2 which is at least 0.5 times L.sub.1 ;further wherein the angle between the straight line length of the lower portion of the segment wall surface and a center line running down the center of the length of the waveguide, referred to as .angle.A is no greater than 15.degree. and wherein the straight line length of the entire segment wall and a center line running down the center of the length of the waveguide referred to as .angle.B is within the range determined by the following formulas:.angle.B minimum=1.5.times..angle.Aand.angle.B maximum=2.5.times..angle.A;further wherein said waveguide body is formed of molded, foamed plastic and said waveguide device includes at its speaker end:an end plate having a speaker face, having anchoring inserts, and having means for attachment of a speaker thereto, said anchoring inserts being securely embedded into said speaker end of said waveguide body.