Thank you for purchasing an GRAVITY Class D amplifier for your car audio system . Now you own an amplifier of uncompromising design and engineering incorporating the latest advanced circuit technology. You will discover soon that our amplifiers display optimum sound with high quality, reliable performance. GRAVITY amplifiers are manufactured with advanced craftsmanship using the highest quality components and strict quality control systems .In order to provide you the best performance, we recommend you to contact an authorized GRAVITY Dealer to do the installation. Please read this manual thoroughly to ensure that you can get the maximum benefit from this new amplifier. When you install it properly, this unit will provide you years of trouble­free performance. 1 Ohm load stable. Double side FR-4 PCB, high quality SMD components. Full range MOSFET circuit design. Adjustable low pass filter. Adjustable High pass filter. Adjustable bass boost frequency and level. Overload, thermal, low voltage protection. Remote level control.