A key parameter for network modeling of the human middle ear is the acoustic energy reflection coefficient, or reflectance, at the eardrum. At high frequencies (above 5 kHz) the reflectance is the only unambiguous indicator of acoustic behavior. Using a technique described recently [J. Acoust. Soc. Am. Suppl. 175,S11 (1984)] eardrum reflectance can be determined by measuring the spatial variation of acoustic phase along the ear canal. The main advantage of this technique is the small amount of space required for the measurements, so only shallow penetration of the ear canal by a probe is required. One problem, at times, with the preliminary work was involuntary movement of a subject's head. This has been largely overcome with the use of an improved head brace and microphone manipulator. This new system will be described and experimental results presented for several subjects. As with the earlier study, high eardrum reflectances, between 65% and 85%, are found above 10 kHz.