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 elimination2.Ground loop isolation3.Cylindrical metal case with heat-shrink tube4.20AMPS5.Input: 30W6.Max Input: 60W7.Freq.Fesp: 20 - 30KHz8.Dimension:30 x 60mmPackage1pc 20A Noise Filter