Down4Sound DOWN4SOUND D4S-NFO1 | RCA Noise Filter

Description 2 Reviews Description DOWN4SOUND NOISE FILTER Noise Filter Input: Female RCA Output: Male RCA Noise Reduction: HIGH Input Type: Female RCA Output Type: Male RCA Noise Reduction: High Sound Quality: Retained Frequency Response: 20Hz-20kHz 2 small wires are ran to any ground location, typically to the frame. View All Close 2 Reviews 5 It WORKS! Posted by Patrick Marshall on Jan 11, 2026 I tried 3 other brands before trying this one, none of them worked. This filter did not reduce the noise 100% but greatly reduced it. Nobody thinks of the looks except D4S, it will be visible so looks really matter to me. This matches my JP amps and my DSP. I only put it on 1 or my 3 rca's. I just bought 2 more. Great product as always. Highly recommend 5 Noise filter Posted by Jason on Oct 30, 2025 I was amazed by the clarity this little noise filter provides. Super clean signal out of the filter. Great product! View All Close