Abstract The reverse-jet overpressure pulse used to detach filter cakes from fabrics in continuously-rated fabric dust filters can be regarded as a random sequence of pulses superimposed on a more slowly fluctuating pressure continuum. These pulses can have rates of rise of 200 Pa.μs−1, considerably more intense than the continuum value of approximately 600 Pa.ms−1 which is necessary to detach the filter cakes satisfactorily. By isolating the continuum pressure electronically, the energy spectra of these pulses have been studied for a range of reverse-jet assemblies. It has been found that the number and amplitude of these pulses can be reduced significantly by suitable design of the reverse-jet assembly. These observations are fully in accord with jet mixing theory when applied to reverse-jet assemblies, as indicated in the previous paper in this series(1).