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Daikin Airconditioning Belgium NV/SA

Avenue Franklin 1B        Welvaartstraat 14-1 bus 3        Rijvisschestraat 118 
B-1300 Wavre                B-2200 Herentals                      B-9052 Zwijnaarde 
T +32 (0)10 23 72 23     T +32 (0)14 28 23 30                T +32 (0)9 244 66 44 
F +32 (0)10 24 49 10     F  +32 (0)14 28 23 39               F +32 (0)9 220 65 10 

What is sound pressure/sound power?

Sound pressure level (Lp) 
Is a measure of the sound energy emitted from a source of noise, expresses in decibel or dBA

Sound power level (Lw) 
Is the above but measured in predefined conditions 
The sound power level is independant on:

  • the location of the equipment
  • the environmental conditions, and 
  • the distance from the measurement point   

The sound power level can be considered as the more precise of the two. The sound power will have a higher value than the sound pressure, bon't be mislead by this. 

The impact of decibels:

Lp dB(A) Perceived loudness Sound 
0Treshold of hearing-
20Extremely softRustling leaves, quiet room
40Very softRefrigerator humming
60Moderately loudNormal conversation, restaurant
80Very loudCity traffic, lorry
100Extemely loudSymphonic orchestra, farm tractor
120Treshold of feelingJet taking off