ROOM MODE BASS ABSORPTION THROUGH COMBINED DIAPHRAGMATIC & HELMHOLTZ RESONANCE TECHNIQUES

摘要

An acoustical bass absorber which reduces peak and dip frequency response errors caused by interference from naturally occuring axial standing waves in rectangular rooms. The apparatus uses two forms of simple harmonic resonance: pistonic diaphragm resonance and Helmholtz cavity resonance. The pistonic diaphragm resonance is achieved by attaching a rigid planar membrane (16) to metal springs (18). The Helmholtz cavity resonance is achieved by constructing an enclosed chamber attached to an open cylindrical tube (24).