What is dB SPL?

The term "dB SPL" is the unit used to indicate the power of ambient sound. "dB" is the abbreviation of decibels (ten bels), which is the logarithmic ratio of a signal versus a reference level "SPL" indicates the reference level and stands for "Sound Pressure Level". The reference level is an air pressure of 20 micropascal (0.00002 Pa = 0 dB SPL).

Some indicative values: 30-40 dB SPL : ambient room noise / whispering 50-70 dB SPL : normal conversation 80-90 dB SPL : feature film soundtrack in a theater 90-110 dB SPL : busy bar with live music (Swiss legal max is 110 dB in a public arena) 110-120 dB SPL : heavy rock concert 130-140 dB SPL : Threshold of pain for the human ear If the gain of the microphone is correctly set, the ARES-P II+ / ARES-BB+ could be used as a sonometer. The value indicated by the modulometer of the ARES-P II+ / ARES-BB+ is the peak value (dB SPLpeak). The peak value is typically 10 dB higher than the RMS (Root Mean Square) value.

Examples: • Input attenuation ... more.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.