In this study, the effectiveness of masking sound not covering the tinnitus frequency was tested against that of conventional masking sound in 117 subjects. Successful masking was observed in 72% of the former and 70% of the latter. There was no remarkable difference between the two maskers regarding the acceptability and intensity. The duration of residual inhibition, however, was smaller in the masker not covering the tinnitus frequency. The masking sound tested could be useful as an alternative when the conventional one is not accepted.