A filtered control provides the motor with cleaner DC power than the one supplied by the unfiltered control. Also, when used with an unfiltered control vs. a filtered one, the motor will most likely run hotter (at the same load point) and will have shorter life. The unfiltered control provides a 130VDC motor with a maximum voltage of 90VDC, which means that the speed of the motor will not reach the nameplate rating, it will be 9/13th of that.