Reducing Total Harmonic Distortion (THD) in electrical power and audio systems requires implementing targeted engineering solutions designed to suppress unwanted harmonic frequencies. In power distribution, engineers deploy passive harmonic filters containing tuned inductor-capacitor circuits, active harmonic filters that inject compensating current waveforms in real-time, multi-pulse rectifiers, and isolation transformers to cancel out specific harmonic orders. In audio electronics, decreasing THD involves improving amplifier biasing designs, utilizing high-grade linear components, minimizing signal path interference, and applying negative feedback loops. These mitigation strategies ensure clean power transmission, protect sensitive hardware, and maintain signal fidelity across industrial and audio setups.