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Biquad Filter Designer

Design RBJ-style sections and inspect a bounded ideal digital response—without processing files.

Engineering model: no mastering, loudness, transducer, amplifier, or electrical-safety claim is made. Coefficients use H(z)=(b0+b1z⁻¹+b2z⁻²)/(1+a1z⁻¹+a2z⁻²); time-domain implementations subtract the exported feedback terms. Validate precision, headroom, state, and platform conventions independently.

Section parameters