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Originally Posted by Pirate
What is the "+ 3dB/- 9dB" bit?
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Quote:
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Originally Posted by EM3
Is that anything like a standard error of measurement? You know like gas mileage will vary depending on how you drive.
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I think it depends. A measurement of error may be part of it, and since no speaker is entirely flat, you usually see +/-3db ratings. i.e. The output in the specified range falls within + or - 3db throughout that range. But, it could very well be that the sub falls off before 18Hz, so, in order to maintain that 18Hz spec, they drop the spec down to -9db. Since you begin to not hear low frequencies at or above 20Hz, and instead feel the pressure waves, that's not necessarily a bogus spec, but it may not be very meaningful either, at least not in direct comparison with other subs. That's if what I'm saying is true of this sub. I believe I've seen Paradigm use similar specs to illustrate that a speaker can reach down low with some authority, but they also include a standard +/- 3db spec for comparisons.