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Koss Pro 5Q Quadraphonic Headphones

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Koss Pro 5Q Quadraphonic Headphones

As information the black plug is for the front and the gray is for the rear when connecting to the headphones jacks of a true quadraphonic amplifier. There is a switch on the headphones for 2 or 4 channel listening. They may be used with a stereo source by just plunging in the black headset jack.