BOSS Audio OX4.400 4 Channel Car Amplifier - 1600 Watts, Full Range, Class A/B, 2-8 Ohm Stable, MOSFET Power Supply, Bridgeable Power - 400 Max x 4 @2-Ohms, 800 Max x 2 @4-Ohms, 1600 Max x 1 Bridged @4 Ohms Bridgeable - Dramatically increase the power output to you speakers and subwoofers by connecting two amplifier channels Variable Bass Boost - With Variable Bass Boost you have the control of exactly how much BASS you want to pump out to your subwoofer(s) Specs – Dimensions: 12.25” x 7” x 2.3”, Weight: 6.4 lbs. BOSS Audio Systems provides a powerful 6 year Platinum Online Dealer Warranty so long as the purchase is made through Amazon.com. We strongly encourage professional installation of this product to ensure proper and safe functionality