The VST Series™ is comprised of two independent compressors and drive systems. The first stage is designed for greater volume at lower pressure while the second stage is designed for the most efficient compression ratio. Utilizing an independent compressor design allows the intelligent AirSmart™ controller to synchronize the second stage compressor speed to the exact needs of the first stage-optimizing the input power of the package. When air is not needed, the VST Series™ compressors stop running and do not vent to atmosphere, thus eliminating any waste compressed air. The “soft” starting capability of the AirSmart™ controller allows the motor to start against a pressurized system at any time and will do so as often as required by the system.