iFi GND Defender Intelligent Grounding Controller – Ground Loop Noise Reduction & EMI Shielding Power PlugiFi GND Defender Audiophile Grade Intelligent Ground Control Silence the Noise. Reveal the Music. In a high resolution audio system, ground loop noise is the enemy of musical truth. Low level hum, buzz, and electromagnetic interference raise the noise floor, mask micro detail, and flatten dynamics. The iFi GND Defender is engineered specifically for audiophiles who demand absolute silence behind the musicwithout compromising safety or system