Boss Audio Riot R1004 400 Watt 4-Channel Car Power Amplifier New, open box Power - 100 Watts Max X 4 @2-Ohms, 50 Watts Max X 4 @4-Ohms Class A/B Topology - Class ?A? Amplifiers Have Enormous Amount Of Current Flowing Through Its Output Transistors With No Audio Signal. Class ?B? Amplifiers Have No Current Flowing Through Its Outputs With No Audio Signal Full Range - With A Full Range Amplifier You Not Only Have The Option To Run Your Speakers, But Also Your Subwoofers Variable Gain Control - The Gain Control Is Not For Adjusting Volume. It Simply Adjusts The Amount Of Signal That Is Coming From Your Receiver And Going To Your Amplifier Please refer to photos to access Items Condition Shipping Policy All new items will be open before shipping to check the content ? If you are International Buyer - contact us before buying Payment Policy ? Item will be shipped immediately on the same or next business day of receiving full payment Return Policy ? Items Condition is clearly stated in the description ? Actual Images of item are shown ? Returns ACCEPTED FOR 7 DAYS, BUT THE BUYER IS RESPONSIBLE FOR RETURN SHIPPING If you have any problems or questions - contact us right away and we will do our best to resolve the problem. Massages are answered from 9:00 AM to 5:00 PM EST Monday through Saturdays Good Luck and Happy Buying *BS7