Crossover 101 - Page 2
Below is a chart to represent the filter order or number of poles, the rate of attenuation and the maximum amount of phase shift in degrees (+/-):
Note: It is possible to build 5th through 7th order but they are not generally used in audio. Most passive crossovers do not go beyond 3rd or 4th order filters, and some passive designs may chose different orders for the low pass than the high pass, (example 2nd order low pass & 3rd order high pass).
The following graphics will depict the roll-off and phase shift apparent in typical filter orders. I will use 800 Hz as the crossover frequency to keep the graph more symmetrical:
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