Royal - 900 Watts 12-inch Carwales Audio Speaker Subwoofer System For The Ultra Clear Sound, Big Bass and Sub-Bass, Big Power Car Subwoofer & Built-in Amplifier (14"x19"x13") (BSX-Z12A) (Black)

Built-in Amplifier: A built-in 400 Max watts amplifier powers the 10-inch Subwoofer Passive Radiator – A driver unit that has it's motor structure (magnet) removed, becomes a passive diaphragm., You will use the Low-pass filter to primarily keep high notes out of your subwoofer(s) High Level Input - Speaker level inputs are commonly referred to as high-level inputs., The ultimate bass experience from the included 30Hz-200Hz subwoofer., High-Output Design: Delivers 900-watt RMS for an extraordinary auditory experience.