The transmittance and reflectance spectra of two‐dimensional sonic crystals made of hexagonal arrays of cylindrical bars in water is reported. The balance of sound fluxes is analyzed by studying angle‐resolved spectra of transmitted and reflected sound for all directions in space. A characterization of the acoustic band structure along the two high symmetry directions in the lattice (i.e., ΓX and ΓJ directions) in a large region of frequencies will be presented. It is shown that, for example, the shape of the stop band features in different types of acoustical spectra is interlinked and must be studied jointly to understand acoustical phenomena in these materials. Moreover, the dependence of acoustical properties as a function of the number of layers is also studied. The experiments are compared with theoretical simulations based on multiple scattering theory. [Work supported by MEC of Spain.]