Sound Absorption of the Absorber Composed of a Shunt Loudspeaker and Porous Materials in Tandem

To investigate the sound absorption of absorber composed a shunt loudspeaker (SL) and porous materials (PM) in tandem, normal coefficients for six samples different groups parameters are measured using impedance tubes. It is shown that composite structure consisting material, an air layer, loudspeaker, layer arranged sequence (PM + Air1 SL Air2) has potential to achieve broadband close three octaves frequency range 200–1600 Hz. further explore mechanism “PM Air2”, theoretical model based on transfer matrix method established, numerical built pressure acoustic module COMSOL Multi-physics field software. The impedances predicted good agreement with those measured. concerned Air2” suitable two distinguishable peaks low domain well spectrum similar material high-frequency domain. reason superior performance lies fact under common action diaphragm’s mechanical vibration, circuit’s damping loss, material’s viscous dissipation, energy consumption mainly dominated by captured PM