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We have available these audiophile quality nickel plated RCA noise reducing caps. Why use caps for your unused RCA jacks? RFI/EMI interference is everywhere and can get into your system through unused jacks on your equipment. Reducing noise will improve detail and resolution, all while helping to keep dirt and dust from getting into your components. Why use Apollo AV noise reducing RCA caps? All our products are manufactured by a highly reputable company to the highest quality standards, using audiophile quality materials and design.