Table 14.

Impact ball’s test results in 1/1 Octave bands.

Frequency (Hz)	Case No. (Difference, dB)
	Base	R1	R2	R3	R4
63	67.2	71.7(+4.5)	72.9(+5.7)	69.5(+2.3)	70.6(+3.4)
125	67.8	65.8(−2.0)	61.8(−6.0)	66.9(−0.9)	60.7(−7.1)
250	57.9	57.0(−0.9)	50.4(−7.5)	55.3(−2.6)	49.3(−8.6)
500	47.6	55.5(+7.9)	51.3(+3.7)	55.5(+7.9)	52.5(+4.9)
SNQ ($L_{i,Fmax,AW})$	50	51	48	51	47