4A FCC EMI Power Filter Module 3 Stage High Frequency Audio Amplifiers Filter AC110V‑250V Item Type: EMI Power Filter For 3 Stage Audio Amplifiers Material: PCB Input Voltage: Single Phase AC 110-250V Output Voltage: Single Phase AC 110-250V Load Rated Current: 4A Input Port: 3 Wire 7.62 Socket Input Output Port: 2 Wire 7.62 Socket Output Design Features. 1. One stage differential mode filtering, two differential inductors, differential mode filtering of AC power supply, suppressing medium and high frequency interference 2. One stage common mode filtering, through X2 capacitor and common mode inductor, combined into common mode filtering. 3. Three stage common mode filtering, due to the use of two stage (also known as two sections) filtering, so the effect of noise filtering better. For some user sites there are repetitive frequency of several kilohertz The problem of fast transient group pulse interference of several kilohertz can play a suppressing role.