Acoustic Sound Pressure Level (SPL) Drop-Off Calculator (120 dB Source Reference)
Precision calculator for sound sources rated at 120 dB. Calculate real-time metrics with formulas, automatic units handling, and instant results.
Formula & Calculation Logic
Lp2 = Lp1 - 20 × log10(d2 / d1)
Inputs used by this tool
Enter values in the interactive controls when the page loads. The result depends on the assumptions and units shown for each field.
Input type: number
Input type: number
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