Audio high-pass filter

Figure 1-102 high-pass filter in FIG. (A), and if we take C1 C2, R1 1/2, then the crossover, H 1/2 root of 2 R1C1. For Figure (b), if take C1 C2, R1 1/4R2, its crossover fH 1/2
Audio high-pass filter - schematic

root 2 R1 C1

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