Gravity Amplifiers Gravity GBR250.4D True 360-Watt RMS Micro Ultra Compact Digital 4-Channel Full Range Amplifier The Gravity amplifiers are considered to the best car audio amplifiers in the world. They are famous for being excellent with bass and voice. Gravity amplifiers are excellent in power and reliability compared to anything else on the market in its' class. Designing the most efficient, well built, high quality amplifiers is where we start here at Gravity. It boosts the car audio sound and improves music quality, clarity, and intelligibility. Best Performance, best in budget. Technical description 4 Channels Full Range Digital Amplifier with Bridgeable Technology. 2 Ohm and 4 Ohm Stable 360 W RMS with 90W x 4 @ 2 Ohm Load, 180W x 2 @ 4 Ohm Bridged. Designed for Stereo Front and Rear Systems that is Micro Compact for little space with Size 1.5 x 3.25 x 7.5 in. LPF, Full or HPF X-Over for adjusting for your perfect sound system. Perfect for your Motorcycle, Car, RV, ATV, Boat and Marine Solution. Come with 1 Full Year Replacement Warranty! Our customers are love it and we are getting good reviews and feedback from them.