ABSTRACT
Much greater flexibility is possible if other filter parameters apart from the cutoff frequencies are manipulated. If we assume we have a fourth-order Linkwitz-Riley crossover, then the lowpass path has two cascaded Butterworth second-order filters. Both the cutoff frequency and the Q of each Butterworth filter could be altered to meet specific requirements, giving us four variables. The highpass path of the crossover similarly has four variables, so there are many more degrees of freedom.
