This high quality noise suppressor can effectively eliminates the noise in the audio line without sacrificing the audio high fidelity. Place it between head unit and AMP or EQ. Features: 1.Signal noise elimination 2.Ground loop isolation 3.Cylindrical metal case with heat-shrink tube 4.20AMPS 5.Input: 30W 6.Max Input: 60W 7.Freq.Fesp: 20 - 30KHz 8.Dimension:30 x 60mm Package 1pc 20A Noise Filter