Product information: Speaker size: 8 inches Total harmonic distortion. 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) 2. 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: 345mm 260mm68mm. 18 inch car audio. Note: This ultra-thin subwoofer is only a bass supplement and cannot be continuously played loudly. Note:This type of railing is not suitable for installation in coastal areas, and it can rust quickly. France, Germany, spain, Italy. Feedback is very important to us. It is impossible to address issues if we do not know about them! Please keep the original box or packaging within 15days since item received. Your satisfaction is our ultimate goal. We work hard to earn your trust and future business. A If you receive a defective item, you may return it or ask for a discount. Due to time zones, our reply to your questions may not be immediately. If it’s non-workdays, please kindly be patient and wait till Monday.