Extending the paper ‘‘Nature of the sound sources in low‐speed jet impingement’’ [A. Powell, J. Acoust. Soc. Am.90, 3326–3331 (1991)], it is first pointed out that the directionality of far‐field radiation of the postulated dominant lateral quadrupoles with one pair of the four maxima randomly oriented in the plane of the plate, i.e., about the normal to the plate (the direction of the other maxima), differs somewhat from that of the individual quadrupoles. Further comparison is now made with experiments by Sutherland and Brown [Tech. Rep. AFFDL‐TR‐71‐180, Wright–Patterson Air force Base, OH (1972)]in which flow resonance occurred, in which the deep minima at close to the theoretical angle were observed. Recent correlation measurements by Shen and Meecham [J. Acoust. Soc. Am.94, 1415–1424 (1993)] for turbulent (nonresonant) impingement noise display deeper minima than do simple intensity measurements, at close to the theoretical 48°. The substantial agreement with experiment appears to validate the type of dominant quadrupole postulated in the theory, and therefore use of both the ‘‘reflection argument’’ [A. Powell, J. Acoust. Soc. Am.32, 982–990 (1960)] and the ‘‘three‐sound‐pressures theorem’’ [A. Powell, J. Acoust. Soc. Am.34, 902–906 (1962)], for such a flow. The latter has implications for certain other flows, e.g., free turbulent jets.