First off, there's a lot of misinformation about frequency out there. Misleading in fact.
The number you're looking for when looking at frequency is how the frequency is determined.
This is expressed in decibels (dB) above or below the mean level of all the frequencies that the speaker is reproducing.
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The industry standard of speaker companies that are serious about sound is (+ - 3dB). The industry standard of speaker companies interested in "marketing" their speakers is (+ - 9dB).
In audio terms, that's a magnitude of 3 times the amount of power (dB) expressed. In short, they're lying, but rationalizing it.
It's that their speakers CAN reproduce those frequencies. If a company doesn't say it's (+ - 3dB), then they're not being completely honest with you. However, since we can't make them all comply, we will play by their "rules" and give you the "Lowest" frequency possible in our ratings (+ - 9dB).
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