1. First of all, we need to prepare a 220V to 24V power transformer, but do not be too large, otherwise it will damage the car radio.
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2. If you want the radio to work at the same time, you'll have to buy a car antenna.
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3. Then buy 2-4 horns (power control at 40W), you can start wiring processing.
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4. As for the connection, it is OK to connect according to the general audio terms.