Acoustic, Noise, Vibration & NVH Products worked example

Decibel Reduction Risk Estimate with db target miss severity of 4 score: a worked example

This worked example runs the decibel reduction risk estimate numbers for a tougher week than the baseline: db target miss severity of 4 score instead of the typical 8 score. Score the risk that a noise-control treatment will miss the required dB reduction target.

The inputs for this scenario

  • dB target miss severity: 4 score (the input this scenario stresses; the baseline uses 8)
  • Miss likelihood: 5 score (held at the documented default)
  • Detection difficulty: 5 score (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: dB reduction risk score = severity × 0.40 + miss likelihood × 0.35 + detection difficulty × 0.25.
  • dB reduction risk score works out to 4.6 dB miss risk score at these inputs, and this is the headline figure for the scenario.
  • Target miss severity works out to 4 score at these inputs.
  • Miss likelihood works out to 5 score at these inputs.
  • Detection difficulty works out to 5 score at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where db target miss severity sits at 8 score and the headline result is 6.2 dB miss risk score, this scenario comes in 25.81% below the baseline at 4.6 dB miss risk score.
  • Use it during design reviews or PPAP gate checks when comparing several acoustic treatments and deciding which need additional impedance-tube or sound-transmission-loss validation. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • dB reduction risk score: 4.6 dB miss risk score (headline result)
  • Target miss severity: 4 score
  • Miss likelihood: 5 score
  • Detection difficulty: 5 score

Run it with your numbers

  • To rerun this with your own numbers, open the live Decibel Reduction Risk Estimate calculator, set db target miss severity to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.