Table 13.

Impact ball’s test results in 1/3 Octave bands.

Frequency (Hz)	Case No. (dB)
	Base	R1	R2	R3	R4
50	63.7	62.5	69.0	61.1	66.6
63	62.1	61.4	66.3	59.2	65.0
80	61.0	70.6	68.7	68.3	65.8
100	62.7	62.7	59.4	62.1	56.9
125	61.9	58.2	54.1	59.7	54.6
160	64.2	61.1	55.9	63.7	56.1
200	56.8	56.2	48.2	54.7	47.0
250	49.2	45.9	43.6	44.0	42.8
315	47.5	46.3	43.3	43.4	41.8
400	43.4	49.8	43.2	47.7	43.7
500	44.8	50.1	44.5	45.4	47.0
630	36.8	51.9	49.3	54.2	50.1