4 Inch Foam Comparison		
Dist.   44Hz	100Hz	447Hz
0	130	130	130
1	93.8	99.3	103.6
2	86.3	92	91.2
3	82.5	83.6	85.5
4	78.9	78.1	81.5
5	75.4	75.7	78.1
6	72.3	70.6	73.8
7	68.2	72.1	69
8	61.4	78.2	68.9
9	59.1	79.6	75
10	60	79.1	71.6
15	61.1	78	74.7
20	61.3	77.2	73.8
25	69.7	76.5	73.2
30	72.6	75.7	69.7
35	71.1	74.8	69.1
40	67.6	74.2	68.4
45	68.7	67.1	66.7
50	68.9	66.3	67.2
55	70.2	63.4	66.3