Profile: Filter Concepts Inc. specializes in offering AC & DC filters, three phase filters and custom EMI filters. Our three phase filters include wide band high performance and motor controller output filter. Our three phase wide band high performance filter provides extended high and low frequency insertion loss, while maintaining low ground leakage currents. Our three phase motor controller output filter series is designed to suppress the high frequency harmonics inherent with PWM output wave forms, without overloading the controller switching elements.