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Finite elements have been successfully used over the past decade to predict the vibro-acoustic behavior of complex large systems as encountered in the transportation industry. Nevertheless, some challenges are still not completely solved as for instance the modeling of multilayer porous materials used to reduce the noise in cavities. A simple model based on local impedance and added mass has been widely used in the past to model those acoustic trim materials at low frequency but shown limitations when the frequency range increases. To circumvent this limitation, approaches based on finite element formulations have been developed to model the poroelastic materials. They range from simple equivalent fluid models to complex models involving a solid phase and a fluid phase. However, those approaches require important modeling effort, computer memory and solution time. A unique approach to model acoustic trim material is presented in this paper.