An experimental study of the boundary-layer velocity profiles and turbulent wall-pressure spectra on a smooth flat plate with varying localized roughness conditions has been conducted in the Anechoic Flow Facility at the David W. Taylor Naval Ship Research and Development Center. The transition and turbulent flow properties are consistent with published results. New data were obtained with a pinhole microphone on the wall-pressure spectra for sandpper surface roughnesses which varied from the hydraulically smooth to hydraulically rough condition. Formulas are presented for estimating the change in wall spectra levels due to the varying surface roughness conditions.