1. Switch the power amplifier channel switch function of the front sound field to the HPF position.
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2. Set the HPF frequency point of the front sound field power amplifier at a position of about 60-70HZ.
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3. Minimize the gain of the front sound field.
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4. Turn the power amplifier channel switch function of the rear sound field to the HPF position You can also turn on the car navigation, find the navigation Settings function key in the upper left corner.