Acoustic Pressure Level Calculator

Here's a comprehensive table summarizing the key aspects of Acoustic Pressure Level:

Aspect	Description
Definition	The logarithmic measure of the effective sound pressure of a sound relative to a reference value2.
Unit	Decibel (dB)2
Formula	SPL = 20 * log10(p / p0) dB12
Reference Pressure (p0)	20 μPa (micropascals) in air12
Frequency Range	20 Hz to 20 kHz (human hearing range)5
Typical Range	0 dB (threshold of hearing) to 120 dB (pain threshold)15
Measurement Device	Sound Level Meter (SLM)4
Frequency Weighting	A, C, and Z weightings (A-weighting most common)45
Time Weighting	Fast (F), Slow (S), and Impulse (I)4
Common Applications	Environmental noise monitoring, occupational noise assessment, audio engineering4
Doubling of Pressure	Increases SPL by 6 dB8
Adding Multiple Sources	Use logarithmic addition: L∑ = 10 log10(10^(L1/10) + 10^(L2/10) + ... + 10^(Ln/10)) dB2
Calibration	Typically at 94 dB or 114 dB using a portable acoustic calibrator4
Standards	IEC 61672 for sound level meters7
Acoustic Impedance	Z = p / v (ratio of sound pressure to particle velocity)2
Distance Law	SPL decreases with increasing distance from the source6

This table provides a concise overview of the key aspects of Acoustic Pressure Level, including its definition, measurement, applications, and related concepts. It covers the essential information needed to understand and work with SPL in various acoustic contexts.