The SNI-1 Eliminates Ground Loop Noise Between Head Unit and Amplifier using RCA style audio connectors. The two brown wires are optional ground connections which sometimes help to reduce line noise, but it depends on the source of the noise.
Perfect Frequency Response from 20 – 20 000Hz
Provides a 1.3dB Gain
Simple RCA Connector Inputs and RCA Connector Outputs
Works on Most Head Unit and Amplifier Combinations
The SNI-1 is directional. The inputs are Male RCA plugs, and the outputs are Female RCA jacks. Insure that the source unit (Stereo, EQ, Etc.) is connected to the inputs of the SNI-1. Connect the brown wires to ground only if there is no sound out of the amplifier, connect them both to the source chassis case.