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Perceived Noise Reduction

The following table shows various dB levels and the corresponding reduction in actual sound pressure level (SPL) as well as the human perceived volume reduction for reducing noise levels.

dB Actual SPL Reduction Perceived Volume Reduction
3 dB 50.00% 18.77%
6 dB 75.00% 34.02%
9 dB 87.50% 46.41%
12 dB 93.75% 56.47%
15 dB 96.88% 64.64%
18 dB 98.44% 71.28%
21 dB 99.22% 76.67%
24 dB 99.61% 81.05%
27 dB 99.80% 84.61%
30 dB 99.90% 87.50%
33 dB 99.95% 89.85%
36 dB 99.98% 91.75%
39 dB 99.99% 93.30%
42 dB 99.99% 94.56%
45 dB 100.00% 95.58%
48 dB 100.00% 96.41%
51 dB 100.00% 97.08%
54 dB 100.00% 97.63%
57 dB 100.00% 98.08%
60 dB 100.00% 98.44%
63 dB 100.00% 98.73%
66 dB 100.00% 98.97%
69 dB 100.00% 99.16%
72 dB 100.00% 99.32%
75 dB 100.00% 99.45%
78 dB 100.00% 99.55%
81 dB 100.00% 99.64%

Additional Resources

Creating Better-Sounding Rooms Download eBook Solutions to Common Noise Problems Download eBook CAD, CSI, & Revit Library  Access Product Cad Files