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How do I read a subwoofer chart with spl and db?

post #1 of 2
Thread Starter 
As an example:

http://www.audioholics.com/reviews/speakers/subwoofers/ultra-12/ultra-12-measurements

I am looking at this and how things drop off at 32Hz.pretty substantially. But it shows 20hz anywhere from 80 - 90db.

What does this mean? Isn't 80db pretty loud? I do not understand.
post #2 of 2
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Originally Posted by likemovies View Post

I am looking at this and how things drop off at 32Hz.pretty substantially. But it shows 20hz anywhere from 80 - 90db. What does this mean? Isn't 80db pretty loud? I do not understand.
The main consideration is the deviation from the average at low frequencies. Where that drops to -3dB you can easily tell that it's not as loud. Where it drops to -10dB it's half as loud. -10dB is considered the lowest useful frequency.
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