One QRT Quantum QKOIL QK1 audio AC Power Enhancer (by Nordost) in a fantastic condition. The QK1 uses a load resonating coil (LRC) to generate a passive electronic field that has a beneficial sonic effect on the AC current. It is the original EU schuko type version for 230 volt and the original box is included. Retail price is 275 euro. Check our other listings for more interesting items. Free shipping worldwide!