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Check the listing for details. 4A EMI Power Filter Board For Pre-Amp Amplifier DAC Headphone DIY Kits. Condition: New. Listed at 3.31 USD. 1PCS EMI 4A Power Filter Board Socket For Pre-Amp Amplifier DAC Headphone. Using imported film capacitors, thick copper wire common mode inductance, high power connectors! 3A current capacity, with the use of a decoder, supple voice, significantly enhance the resolution, clean background.