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Message: <blockquote data-quote="squeak9798" data-source="post: 791601" data-attributes="member: 555320">Bandpass filter; run a lowpass and highpass (or use a subsonic filter) on the speaker at the same time.  Creates only a "passband" of unattenuated frequencies.Though, I'd just like to point out....crossovers aren't brick walls, even with a lowpass filter on the speaker, 4.5khz will still be "played" by the speaker.  However, the crossover point and slope will determine how much the signal is attenuated at 4.5khz.  With a lowpass xoverpoint of 4khz, 4.5khz will still pass through to the speaker and be relatively audible (unless you are using an insanely steep slope).</blockquote>

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