Rabiner, Laurence, and Durlach [J. Acoust. Soc. Amer.40, 62–70 (1966)] reported that the masking‐level difference (MLD) for uncorrelated noise with signals in‐phase and reversed in‐phase at the ears was independent of signal frequency for frequencies between 150 and 1000 Hz. Since all other “MLD conditions” show marked signal‐frequency effects, and since the E‐C model predicts that such effects will also occur with uncorrelated noise, the present study reinvestigates the effect of signal frequency on the MLD for uncorrelated noise. The results indicate that the MLD for NUS0 decreases with increasing signal frequency.