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RE: subwoofer crossover perhaps i am misunderstanding....

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Well, there's more to crossovers than just the frequency, crossovers also have a slope. Meaning, if you have a low pass crossover set at 60Hz, for example, unless it has a very, very steep slope it's still going to let 120Hz pass, just attenuated. They aren't perfect "brick walls".

For example, you might see a spec saying "12dB/octave". That means that there's 12dB of attenuation for every octave you go up (or down, for a high pass filter). So at 60Hz, there would be no attenuation. At 120Hz, there would be 12. At 240Hz, 24dB. And so on...that's why you're still hearing those higher tones, just at lower volumes.

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