SP395 SoundPro Audio Integrator Form7492 Operation Manual
105
APPENDIX A - dB SPL Scale
The 0 dB SPL reference level is set at 20 µPa (pressure equal to the threshold of
hearing at 1 kHz). This places the upper threshold of pain near 135 dB SPL. Unless
otherwise noted, SPL readings use this reference and omit the "SPL" notation. For
example, a sound level expressed as 60 dB is actually 60 dB SPL, referenced to 20
µPa.
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