The speeds of sound in {xH(CH2)(v)O(CH2)(2)O(CH2)(2)OH + (1 - X)H2O} for v = 1, 2, and 4 have been measured over the whole range of x at the temperature T = 298.15 K. The molar isentropic compressibilities K-S,K-m of these solutions were estimated from the products of the molar volume and the isentropic compressibility kappa(S), and the excess values K-S,m(E) were also calculated. The behaviour of the K-S,m(E) curves for the series of mixtures is similar to that found previously for their excess molar volumes. Also, the deviations of the speeds of sound u(D) has been defined and calculated for all measured values of x. These values were compared with the mixing function delta u calculated in the literature. The behaviour of u(D), delta u, and K-S,m(E) with composition and the number of carbon atoms in the aliphatic chain of the alkoxyethanol is discussed.