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The Interaural Time Difference (ITD) is the primary cue for sound source localization. Although the ITD has been intensively studied, there are still many open questions. This paper focuses on the ITD in relation to minimum phase filter modeling for binaural synthesis. Comparison of the ITD estimate methods highlights discrepancies for locations near the interaural axis. A sub jective experiment was performed to estimate the ITD value to use with a given pair of minimum phase filters. The task of the sub ject consists in adjusting the ITD of the test sound until its perceived location matches the target sound. The psychoacoustic value of the ITD is compared with computational estimates from Head Related Transfer Function (HRTF).