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Chapter 4: Crossover Types > 4.8 Fourth-Order Crossovers

4.8  Fourth-Order Crossovers

The fourth-order crossovers give still greater separation between the drive units than the first-, second-, or third-order types. The 24 dB/octave slopes minimise the chance of exciting out-of-band drive unit irregularities like the tweeter or mid-range resonance will be excited. Modulation distortion will be further reduced, though probably not to a great extent. The sensitivity to driver time-delay misalignments is further lessened due to the narrower crossover region. The fourth-order Butterworth crossover does not gives a flat summed amplitude response but the fourth-order Linkwitz–Riley famously does. For the Butterworth and Linkwitz–Riley versions, inverting one output gives a useless response with a deep notch at the crossover frequ....


  

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