400w Universal Class Ab Digital 2 Channel Black Aluminum Alloy High Power Car Audio Amp Subwoofer Amplifier - Amplifiers - AliExpress
2) Boss CX8 8 400 Watt 8" Car Audio Subwoofers Subs+Mono Amplifier+Amp Kit | Audio Savings
Amazon.com: BOSS Audio Systems BE8AE Elite Series Car Audio Amplifier 8 Inch Subwoofer Package – 400 Watt Sub with Passive Radiator, Built-in Class D Monoblock Amplifier, for Truck Boxes and Enclosures Stereo :