ABSTRACT
Linkwitz-Riley filters, with Butterworth filters, are the only ones that have all stages set to the same cutoff frequency, as shown in Table 7.4. Unlike Butterworth filters, only a few different values of Q are used. Using the table with the stage cutoff frequencies shown will give an amplitude response −6 dB down at the cutoff frequency; this is the “natural” cutoff attenuation for a Linkwitz-Riley filter. If you want to use the more familiar −3 dB criterion for cutoff, then you will need to change all the stage frequencies in Table 7.4 to 1.543.
