The VPI Analog Drive System, or ADS, is a high-tech speed-selection device for 33 1/3 and 45RPM LP playback. Free of digitally based electronics, the extraordinary-sounding ADS represents an evolution of the function embodied by VPI's SDS (Synchronous Drive System) and an entirely original way at looking at the speed controller concept. Audibly superior to SDS, ADS represents VPI's biggest non-turntable breakthrough in the 21st century and brings bold, across-the-board enhancements to the performance of almost any turntable. If your 'table uses an AC Synchronous motor that draws less than 10 watts, you owe it to yourself – and your analog setup and vinyl – to audition this new motor controller. Simply plug your rig into ADS and hear the improvements a truly powerful motor drive creates: Deeper bass, smoother midrange, sweeter highs, lower noise floor, deeper imaging, airier top end, and reach-out-and-touch-it solidity. (Important note: VPI ADS is NOT compatible with turntables that have an outboard or wall-wart power supply. If you cannot directly connect an IEC power cord to your VPI 'table, ADS will not work.)