Caution: Before making any connections to the power terminals, make sure that the (-) negative of the vehicle's battery is disconnected. It is necessary to join the 2 yellow wires (Batt+) and join the 2 black wires (GND) (Do not use the vehicle's original wiring. Make a new installation directly from the battery). The LINE OUT output allows you to send the audio signal (not amplified) to other equipment, such as an amplifier or active subwoofer. If you use this output to send signal to external amplifiers, an adjustment (decrease) of amplifier's input gain is recommended. The recommended Positive / negative power supply cable is 4mm². For ACC Cable is 0.75mm². For cable P. Antenna / Remote is 0.75mm² and for fuse or circuit breaker protection is 20A. NOTE: It has 2 protection fuses, the external 15A (low-power mode) and the internal 20A (high-power mode). It is equipped with a long-distance remote control and integrated crossovers (HPF, LPF and Full), with FM reception, USB input and smartphone connectivity (BT). Taramps Amplayer 400 is powerful and versatile, it offers 400 WRMS (4 x 100W at 2 ohms) and allows ‘Bridge’ connections (2 x 200W at 4 ohms).