Pro-Ject High Power It 2 Power Supply 15V DC Power SupplyImportant Compatibility Note Only compatible with 15V DC Pro Ject turntables. The Importance of Proper Grounding Every turntable needs proper grounding to prevent electrical hum. Without grounding, a turntable may have a different reference potential than the connected amplifier. This difference creates a compensating current heard as an audible hum. How Traditional Grounding Works High quality turntables include a separate ground cable that connects