Second Order (12db/octave) Two-Way Crossover
- Linkwitz-Riley crossovers match attenuation slopes so that system response is flat at crossover point.
- Butterworth crossovers yield to a peak at the crossover frequency.
- Bessel crossovers have a frequency response between Linkwitz-Riley and Butterworth crossovers.
- The phase shift on a second-order crossover is 180 degrees (reversed polarity).
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