  We present a method to extract monopole and dipole polarizability from
experimental measurements of two-dimensional acoustic meta-atoms. In contrast
to extraction from numerical results, this enables all second-order effects and
uncertainties in material properties to be accounted for. We apply the
technique to 3D-printed labyrinthine meta-atoms of a variety of geometries. We
show that the polarizability of structures with shorter acoustic path length
agrees well with numerical results. However, those with longer path lengths
suffer strong additional damping, which we attribute to the strong viscous and
thermal losses in narrow channels.
