8 Inch Car Audio Audio Bass Box Speaker Car Under Seat Slim Amplifier Active Subwoofer 600W For Cars W/ 12V Power Supply. 8Inch 600W Car Under Seat Slim Amplifier Active Subwoofer Audio Bass Box Speaker. Wiring: three wires must be connected. (If there is no sound after installation, please check whether the wiring is connected to the three wires: 12v to the battery positive stage, REM to the host ACC or 12v in series, GND ground). Adaptation: all cars with 12V power supply can be used. 600W bass, the 68mm thin subwoofer is directly installed under the passenger seat. 8 inch high-power active subwoofer, excellent low frequency performance, pure low music output, surging sound effect. PU leather wooden body. PU leather-wrapped wooden body reduces noise caused by vibration to a limited extent. High-strength stainless steel horn protective net cover, black paint, not easy to rust. 1.4mm thick mesh material, strong pressure resistance. Frequent maintenance and maintenance will enable the speaker to obtain longer battery life. Speaker size: 8 inches. Signal to noise ratio:? 90dB. Bass boost: 0 to+ 12dB. Product size: 2636.56.8cm/10.2314.372.67inch. 18 inch car audio. Note: This ultra-thin subwoofer is only a bass supplement and cannot be continuously played loudly.