We consider the effect that abnormal granulation observed in active regions should have on the propagation of acoustic waves. Any such effect is found to be limited to a shallow surface layer where sound waves propagate nearly vertically. The magnetically suppressed turbulence implies higher sound speeds, leading to shorter travel times. This time shift is independent of the travel distance, while it shows a characteristic dependence on the assumed plage field strength, plotted in Figure 2. As a consequence of the variation of the acoustic cutoff with height, the time shift is expected to be significantly higher for higher frequency waves within the observed regime of 3-5 mHz. The lower group velocity near the upper reflection point further leads to an increased envelope time shift, as compared to the phase shift. These characteristics of the time shifts are in accordance with observations. The calculated overall amplitude of the time shift is about ten seconds, comparable to, but still significantly less than suggested by measurements.