4-Channel RCA Audio Noise Filter Suppressor Ground Loop Isolator Car Stereo 50W Description:  Name:RCA Audio Noise Hum Filter 100% Brand New and high quality! Connectors: 4x RCA Male, 4x RCA Female Color: Blue (as the picture shows) Eliminates humming and buzzing due to ground loop issues Filters out DC current in the signal path Passive in-line device Gold plated connectors Rated input: 50W Peak input: 100W Eliminate ground loop humming and buzzing noise between an audio source and an amplifier. Place between the head unit and the amp or EQ. Package including： 1x Audio Noise Filter Notice: Due to the different monitor and light effect,the actual color maybe a slight different from the picture color.