I have a 1983 Pyramid SE808ECHO integrated 200 watt amplifier/ 10-band Graphic Equalizer. (Serial # 204026). I am trying to hook this up to an older car and need help with color codes on the wires. There are 1 green, 1 red, 1 gray and 2 black wires coming from the back of the unit. I know that the red is power, the green is right sspeaker, and that one of the black wires is labeled as ground. I need to know what the other black wire and the gray wire are for. Thank you.
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