Loud pure hole tones between 2300 and 10,000 Hz were induced in a jet by establishing turbulent flow of gaseous nitrogen through a rectangular chamber with a sharp-edged orifice at the exit. Visual observations of the jet and velocity measurements indicated a very drastic spread of the jet near the orifice exit in the presence of the loud pure tones. The potential core appeared to be no longer present and the flow-field became asymmetric. The enhanced spread of the jet and the asymmetry were not observed when the flow field had a broad-band frequency spectrum. Wavelet analysis of the instantaneous planar Mie scattering flow images was performed with a view to qualitatively study and compare the entrainment and mingling in two jets with and without acoustic self-excitation. Copyright ©2005 Begell House, Inc.