Densities, refractive indices, speeds of sound, and shear viscosities for the mixtures of diethylene glycol dimethyl ether with ethyl acetate, methyl benzoate, ethyl benzoate, or diethyl succinate are measured as a function of mole fraction at temperatures of 298.15, 303.15, 308.15, 313.15, and 318.15 K. The values of these properties are fitted to a power series equation involving both temperature and the mole fraction of the mixture. The experimental values of the mixtures and pure liquids are also used to calculate excess molar volume V(E), changes in isentropic compressibility DELTAbeta, changes in refractivity DELTAR, and changes in viscosity DELTAeta for the mixing process. These results are fitted to the Redlich-Kister polynomial relation to estimate the binary coefficients. The specific acoustic impedance factor of the liquids has been calculated to see a possible match of their values with that of sea water, and the potential applications of these liquids as sonar transducer fill fluids have been investigated. The refractive index and density values of the mixtures are used to test the accuracy of the available refractive index mixing relationships in predicting the binary refractive index data. Viscosity results are also analyzed by using the viscosity equations of McAllister, Heric, and Auslaender.