iFi Audio AC iPurifier Accessories Active Noise Cancellation Specifications :
1. Active Noise Cancellation (ANC) Military technology, most advanced noise-cancellation available.
2. Wireless Purification System Complex circuit that significantly reduces power-line noise without audible or visible side-effects.
3. Ground/Earth connection diagnostic Detection of missing Ground/Earth.
4. Polarity connection diagnostic Detection of polarity fault.
5. Audio Earth connection This adds a solid Ground/Earth with ground-loop prevention circuit built-in.
6. Overvoltage Surge Protection Auto-recovery.