Some acoustic features of vapor-drop and vapor-gas-droplet mixtures were examined. It is shown that in such mixtures the dependence of the damping factor on the mass concentration of the suspended phase may be nonmonotonic. The criteria for the existence of such a nonmonotonic dependence are given. On the basis of the analytical expressions obtained and numerical calculations it was established that at a small content of suspended phase thermal dissipation may exceed the viscosity because of relative motion of the phases. The model integrates properties such as thermal conductivity and diffusion into the acoustic behavior of the mixtures and includes an equation of state and a version of the Clapeyron-Clausius equation for the vapor. Phase velocities and damping coefficients are plotted.