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6 <br />Changes in Sound Levels <br />Difference in dB Levels Change in Pressures <br />Perceived Change L2 - L1 , dB (P2 -P1) / P1 % Change in Pressure Sound Pressure Effect <br />Sounds twice as loud 10 2.16 216%Increase in pressure <br />8 1.51 151% <br />6 1.00 100%Pressure doubled <br />noticeably louder 5 0.78 78% <br />just noticeable change 3 0.41 41% <br />not noticeable 1 0.12 12% <br />0 0.00 0%No change <br />not noticeable -1 -0.11 -11% <br />just noticeable change -3 -0.29 -29% <br />noticeably quieter -5 -0.44 -44% <br />-6 -0.50 -50%Pressure halved <br />-8 -0.60 -60% <br />Sounds half as loud -10 -0.68 -68%Decrease in pressure <br />Building Sources <br />Loading Dock Sources <br />BOSTON SCIENTIFIC - BLDG 14 NOISE BARRIER WALL | 8 <br />ACOUSTICAL PERFORMANCE