for the first chamber 36 and the second chamber 38 the first chamber 36 is as depicted for the chamber 12 in fig1 the second chamber 38 shares a common sidewall 40 with the first chamber 36 the second shoe 44 of the second chamber 38 is substantially longer than the first shoe 24 of the first chamber 36 it is preferred that the second shoe 44 be at least about 50 longer than the first shoe 24 to optimize the consistency of the output from the first chamber 36 and the second chamber 38 it is preferred that the angle of impact u03b8 for the filaments 16 in both chambers be the same and be between about 50 u00b0 and 70 u00b0 both the first chamber 36 and the second chamber 38 exhaust to a common exhaust chamber 46 fig4 is a schematic representation of another two chamber crimping device where the first chamber 36 has a cross sectional area a 1 which is less than the cross sectional area a 2 of the second chamber 38 it is preferred that the difference in the cross sectional areas between the two chambers be at least 50 both the first chamber 36 and the second chamber 38 exhaust to a common exhaust chamber 46 the two chambers because of their different geometry will produce plugs 30 with different geometry when the input parameters for the group of filaments 16 such as fluid temperature fluid pressure and angle of impact of the filaments 16 with.