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Just add them up in dB properly.","exampleUseCases":[{"title":"Combining multiple machine noise levels","prompt":"I have three machines in my factory floor measuring 72 dB, 68 dB, and 75 dB — what's the combined sound pressure level in dB?"},{"title":"N identical speakers on a stage","prompt":"If I have 8 identical speakers each rated at 90 dB, what's the total SPL I should expect when they're all running?"},{"title":"Subtracting background noise from measurement","prompt":"I measured a total level of 78 dB in a room, but the background noise is 70 dB — what's the actual level of just the source after background correction?"}],"resultDescription":"Returns the computed total dB level, average dB, loudest dB, the dB increase over a single source, the calculation mode used, a plain-language summary, and a disclaimer about assumptions. 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Prefer it over generic calculators when working with SPL, noise surveys, or multi-source audio setups where linear addition would give wrong results.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T13:08:25.526Z","isFirstParty":false,"canonicalSlug":"audio-calc-db-level-summation-background-subtraction-254820ad"}