Study on the effect of vent on the electroacoustic absorber

Electroacoustic absorber (E.A) with a sealed enclosure has limitation of sound absorbing performance due to the resonance characteristic of a loudspeaker that works as its actuator. Specifically, the sound absorbing performance of E.A decreases at the lower and higher frequency range on the basis of the resonance frequency of the loudspeaker. To overcome this limitation, it suggests to utilize a vented enclosure rather than the sealed enclosure in the E.A system. First of all, the effect of the vent on the E.A is analyzed through the related formulas and simulation results. Then, the corresponding experiment is conducted to verify the aforementioned analytical results. Finally, this paper reveals that the vented enclosure increase the performance of E.A up to a certain point at frequencies below the resonance frequency of the loudspeaker. From the user's point of view, this passive method using the vented enclosure leads to put it to better use.