Review on Enhanced Noise Filter B25N: BOSS Audio Systems Ground Loop Isolator for Optimal Car Audio Performance by Tim Sterling

It's cheap and works for what I need, but the inlet and outlet are reversed. If you connect the left channel (white), it comes out the right channel (red) at the other end. I thought it was just one device but I've bought 14 more of these and have tested 5 back-to-back so far and all 5 have inputs and outputs backwards connected. Factory. For someone like me and others who may be troubleshooting, the question might be why are the wires swapped and unknowingly flipping the wires to match the colors and remix the signals. I use this to filter out some background noise from the sound processor. but I am using one channel for one particular signal and another for another source and this color confused me the first time I tuned in and wondered why I was getting the wrong signal. Maybe I just have a bad batch, but you can check yours.