High Pass -Is just that, it lets all the high(er) freqs pass through and blocks out or (smuthers the lower frequency at the selected slop) 6,12,18,24db/oct etc Low Pass -Opposite, lets all the low(er) freqs pass and blcosk the high(er) freqs. Depending if its a selectable filter or non. For lows you basically want anything under 100hz or so to go to the subs (adjustable by taste and speaker setup) For highs generally 100-120hz and up.
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