Densities, rho, and speeds of sound, u, of binary mixtures formed by aniline or N-methylaniline or N-ethylaniline with diisopropyl ether (DIPE) have been measured over the entire range of composition at a temperature of (303.15, 313.15, and 323.15) K and atmospheric pressure. The rho and u values were used to calculate isentropic compressibilities, kappa(S), excess molar volumes, V(m)(E), and excess isentropic compressibilities kappa(E)(S). The results have been used to investigate molecular interactions and structural effects in these mixtures. The speed of sound u in present mixtures has been estimated using several theoretical models to determine their relative predicting ability in terms of pure component properties. The ERAS model is applied to study V(m)(E) for DIPE-aniline and oxclane-aniline mixtures at: (303.15, 313.15, and 323.15) K. The ERAS model represents qualitatively very large negative V(m)(E) data.