Abstract: An improved loud speaker mounting frame having a continuous conic shape in cross section, so that by means of the conic and apertures along the apex on one side of the conic cross section shape the interference of negative sound waves within the cabinet is reduced and resonance problems of the cabinet are eliminated. Efficiency of the loud speaker system is thereby improved. The concept of conic formation includes an improved V-shaped filtering wave modulation plate utilized in small speaker cabinets.

Abstract: A coaxial-type multi-speaker system is provided for use in automobiles which includes a low frequency transducer, a high frequency transducer, and a cover of elongated substantially half-cylindrical periphery open at the two oppositely disposed lengthwise terminating ends. Inside the cover there are two sound reflector panels of substantially V-shaped cross section positioned perpendicularly to the length of the cover in double level fashion. Sound output thereof is of symmetrical fashion, suitable for application in confined environments where listeners are prone to occupy one of several designated locations.