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10 decibels increase mean measured on a sound pressure level meter. SPL meter. Forget the intensity, because the ear drums and the microphone diaphragms are moved by the sound pressure. 10
110 decibels means (1011 or 100,000,000,000) times as much as you started with.
15 subwoofers would produce 15 times as much power. log1015 = 1.176; to convert that to decibels, you have to multiply it by 10, so you get an increase of 11.76 decibels, in other words, 180 + 11.76 = 191.76 decibels. Since the 180 decibels probably includes some rounding, it makes sense to round the final result, too - for example, to 192 decibels.
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Volume in math means the amount of space an object occupies. Volume in music means amplitude, loudness, or sound pressure. Scroll down to related links and look at "How many decibels (dB) is twice (double, half) or three times as loud?".