![]() ![]() ![]() The HPF and LPF set point frequencies must complement each other, otherwise there will be destructive contention between the two filters, with critical musical information caught in the middle. That’s where the need for setting the HPF and LPF at complementary points becomes critical. This also means that one half octave below the set point (60 Hz in this example) the attenuation is only -12 dB. If you set the crossover HPF for 80 Hz, that means that at 40 Hz (one octave below 80 Hz), the signal is -24 dB lower in volume than at the set point. A -24 dB slope means that for every octave you move away from the set frequency, the signal will be attenuated by -24 dB. Is the crossover slope -6, -12, -24 dB or some other number?Ī slope of -24 dB is fairly common in hi-fi systems, so we’ll use that as our example. (An octave is a doubling or halving of a frequency: One octave below 80 Hz is 40 Hz one octave above 80 Hz is 160 Hz). This is done by defining how much attenuation takes place per octave. Crossover slope (sometimes referred to as ‘roll-off’) defines the rate the signal increases or decreases. The slope tells us how long (in frequency) before the filter turns off all frequencies to a point where we can’t hear them.
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