In private mode, the minimum SPL must be the greater of 10 dBA above the average ambient or 5 dBA above the maximum sound level with a duration of 60 seconds or greater. If the average ambient is 23 dBA and the maximum is 34 dBA, what is the minimum SPL required?

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Multiple Choice

In private mode, the minimum SPL must be the greater of 10 dBA above the average ambient or 5 dBA above the maximum sound level with a duration of 60 seconds or greater. If the average ambient is 23 dBA and the maximum is 34 dBA, what is the minimum SPL required?

Explanation:
The main idea is that in private mode the minimum SPL must be higher than both thresholds: ambient plus 10 dB and the maximum level plus 5 dB, and you take the higher of those two values. Calculate the two thresholds: average ambient 23 dBA plus 10 dBA equals 33 dBA. Maximum sound level 34 dBA plus 5 dBA equals 39 dBA. The greater value is 39 dBA, so the minimum SPL required is 39 dBA. That’s why the appropriate choice is the one showing 39 dBA. The 33 dBA option would not meet the max+5 requirement, 29 dBA is too low, and 44 dBA is higher than what’s needed.

The main idea is that in private mode the minimum SPL must be higher than both thresholds: ambient plus 10 dB and the maximum level plus 5 dB, and you take the higher of those two values.

Calculate the two thresholds: average ambient 23 dBA plus 10 dBA equals 33 dBA. Maximum sound level 34 dBA plus 5 dBA equals 39 dBA. The greater value is 39 dBA, so the minimum SPL required is 39 dBA.

That’s why the appropriate choice is the one showing 39 dBA. The 33 dBA option would not meet the max+5 requirement, 29 dBA is too low, and 44 dBA is higher than what’s needed.

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