The RCA ends do not attach to the RCA inputs/outputs on the back of the CD player or amplifier, making cables after many trips literally easy due to road vibrations fall off / bass, I checked the resistance of the cables with a measuring device before installation, but didn't even think of permanent connections, since I had never experienced that before installing several car radios in the last 20 years. Finding this after gutting the car interior and running wires is very frustrating to say the least, sound quality is ok but I can't recommend it for a flush or permanent installation as the connectors never need to be taped in order to to prevent this.
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