A first experiment has confirmed the findings of Hirsh and of Jeffress with respect to the effects of changes in the interaural phase difference for both noise and tone on the masked binaural threshold. The threshold for a low‐frequency tone is some 12 db higher when both tone and noise are in phase at the two ears, than when either one is 180°. A second experiment utilized a high‐frequency band of noise at a high level to produce “remote masking” for the same low tones in order to determine whether or not this other kind of masking would be similarly affected by changes in interaural phase. With the noise band in phase, a 180° change in the phase of the low‐frequency tone produces a change in threshold of only slightly less than 12 db. But a similar change in the phase of the noise band produces no change in masking, except for a slight shift that can be predicted from the time shift at low frequency that would correspond to a half‐wave in the high‐frequency band.