8A 20A 50A Car Audio Power Filter EMI High-Frequency Electromagnetic Interference Filter EMC Automotive Audio Filter Dedicated LC EMI Filter for dc 5v 12v Audio Systems Operating Voltage: 5V - 20V DC It/s well-known that numerous interference sources exist inside a car - the engine, spark plugs, electromagnetic switches, and alternator all generate interfering signals. This filter employs a high-current, three-stage LC-EMI filter circuit to effectively eliminate high-frequency noise and electromagnetic interference. (Note: Throttle-induced whining noise (/quot;airplane sound/quot;) is caused by ground loop interference, which is not addressed by this filter and requires an isolated power supply solution, available in our store) .These interferences significantly degrade car audio systems. Actions like honking the horn, opening/closing doors, operating power windows, or flashing headlights can generate high-frequency EMI. This is particularly noticeable in certain / models where modifications like adding low-level outputs or digital outputs often result in hearing annoying high-frequency noises (buzzing or hissing sounds) through the speakers during these operations. Beyond effectively eliminating the above interferences, this filter performs a crucial additional function: Power Purification! It delivers a cleaner audio background and more transparent sound quality.Power Rating (Example at 12V System Voltage): 50A Model: Continuous Power: 600W Peak Power: 750W Ideal for: Car amplifiers, DSPs with amplifier functions, and other high-power devices. 20A Model: Continuous Power: 240W Peak Power: 300W Ideal for: Car head units, preamps, decoders, and other low-power devices. 8A Model: Continuous Power: 96W Peak Power: 120W Dimensions: 8A Model: 45 x 37 x 20 mm 20A Model: 92 x 48 x 30 mm 50A Model: 90 x 60 x 35 mm