Baffle Math
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L-pad and Zobel

K = 10^(A/20). Series R1 = Z x (K - 1) / K. Parallel R2 = Z / (K - 1). Attenuation must be greater than 0 dB.

Zobel: R_z = 1.25 x R_e and C_z = L_e / R_z^2. Enter L_e in henries or millihenries.