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Message: <blockquote data-quote="keep_hope_alive" data-source="post: 7549386" data-attributes="member: 576029">bandpass needs depend on the speaker. some woofers have a natural high frequency roll-off, other have a lot of break-up and response variations at high frequencies.  the inductance of the voice coil will provide roll-off anyway.if you want to be safe - a 6 dB/oct low pass filter (passive) centered at 3-4kHz would be fine.a high pass filter depends on the woofer used and the rear speaker location.</blockquote>

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