More Calculators


PrexisSymbolFactor
yottaY1024 = 1,000,000,000,000,000,000,000,000
zettaZ1021 = 1,000,000,000,000,000,000,000
exaE1018 = 1,000,000,000,000,000,000
petaP1015 = 1,000,000,000,000,000
teraT1012 = 1,000,000,000,000
gigaG109 = 1,000,000,000
megaM106 = 1,000,000
kilok103 = 1,000
hectoh102 = 100
dekada101 = 10
decid10-1 = 0.1
centic10-2 = 0.01
millim10-3 = 0.001
microµ10-6 = 0.000,001
nanon10-9 = 0.000,000,001
picop10-12 = 0,000,000,000,001
femtof10-15 = 0.000,000,000,000,001
attoa10-18 = 0.000,000,000,000,000,001
zeptoz10-21 = 0.000,000,000,000,000,000,001
yoctoy10-24 = 0.000,000,000,000,000,000,000,001







Sound Pressure Pa Sound Pressure Level dB





Enter a Sound Pressure Level SPL for A: dB

Enter a Sound Pressure Level SPL for B: dB

Result = dB






Level change dB
Loudness times louder
Sound Pressure times bigger
Intensity times bigger



Level Change Loudness Sound Pressure Intensity
+40 dB
 16 times louder 100 times 10000 times
+30 dB
 8 times louder 31.6 times1000 times
+20 dB
 4 times louder 10 times100 times
+10 dB
 2 times louder
(i.e. 110dB heard as being twice as loud as 100dB)		 3.16 times
(i.e. Summing Ten lots of 2Pa =2Pa*3.16)		 10 times
(i.e. Summing ten lots of 100dB =110dB)
+9 dB
 1.87 times louder 2.82 times 7.94 times
+8 dB
 1.74 times louder 2.51 times 6.31 times
+7 dB
 1.62 times louder 2.24 times 5.01 times
+6 dB
 1.52 times louder 2 times 4 times
+5 dB
 1.41 times louder 1.78 times 3.16 times
+4 dB
 1.32 times louder 1.58 times 2.51 times
+3 dB
 1.23 times louder
(i.e. heard as a 23% increase in loudness)		 1.41 times
(i.e. 2Pa + 2Pa = 2.82Pa) 		2 times
(i.e. 100dB + 100dB = 103dB)
+2 dB
 1.15 times louder 1.26 times 1.58 times
+1 dB
 1.07 times louder 1.12 times 1.26 times
+0 dB
 no increase no increase no increase






Room Modes The dimensions of a room will create room modes. This gives an uneven frequency response in the room, and there will be hot spots in the room which are much louder or quieter.

To minimise room modes room dimensions should be carefully selected.

Recent research from Salford University suggests that the optimal shape is around this ratio: 1: 2.18 : 3



A-Weighting
1/3 Octave Band dB
Centre Frequency (Hz)
50 -30.2
63 -26.2
80 -22.5
100 -19.1
125 -16.1
160 -13.4
200 -10.9
250 -8.6
315 -6.6
400 -4.8
500 -3.2
630 -1.9
800 -0.8
1000 +0.0
1250 +0.6
1600 +1.0
2000 +1.2
2500 +1.3
3150 +1.2
4000 +1.0
5000 +0.5
6300 -0.1
8000 -1.1
10000 -2.5



Blue Tree Acoustics