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The RCA cable that is attached to the yellow connector at the TrafficPro is routed through the center console of the car, under the back seat and into the trunk compartment to the AudioControl 13 band Equalizer (white unit on bottom). The signal then goes to the AudioControl 4XS Electronic Crossover that sends the appropriate frequencies to the 3 amplifiers seen in photo #1. There are no passive crossovers used anywhere in this install.