In this paper an experimental investigation of the pressure drop caused by porous media in oscillating flow has been performed. Generally, only one term is needed to macroscopically characterize the viscous losses for stationary flows in porous media: the static permeability, or the Darcy number as dimensionless number. In oscillating flows, two terms are needed to characterize the linear Darcy term due to the temporally phase shift between the pressure gradient and bulk velocity, or a so-called dynamic permeability. In this work, through an acoustic setup, such dynamic permeability is presented for different porous media after postprocessing the acoustic pressure data. The results show that for frequency tending to zero the static permeability is recovered. For high operating acoustic pressure, a departure from the linear relation between pressure drop and bulk velocity is discussed.