If your car has Logic 7 system, or factory car radio plug has fiber optic input WITHOUT 8 speakers cables as shown below, A0581 decoder box is required for installation. If your factory car radio plug has fiber optic input with 8 speakers cables as shown on the left, then it’s applicable to your car, and no need A0581 decoder box. Note: Please make sure the car fiber optic connector is working properly before installation. Installation Steps 1. Take the black plug out of the decoder box, and remove the plastic protective cover from the plug. 2. Connect the factory car fiber optic interface to the black plug, and then reinsert the plug to decoder box. .
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