Focal AP 4.380 4 Channel AmplifierAP 4. 380 4 channel amplifier The AP 4. 380 amplifier combines performance and versatility to supply an audio kit by car and thus offer a complete system. Simple to integrate with its RCA input which allows it to be easily connected to the car radio, this reinforcement of class A B power maximizes sound dynamics by car, for ever deeper listening. FLEXIBILITY Versatile, the AP 4. 380 adapts to a wide range of configurations: 4, 3 or 2 channels,