Planet Audio P10AW Amplified Car Subwoofer - 1000 Watts, Low Profile, 10 Inch Subwoofer, Remote Subwoofer Control, Great for Vehicles That Need Bass But Have Limited Space Built-in Amplifier - A built-in 1000 Max watt amplifier powers the subwoofer Mosfet Power Supply - With a MOSFET power supply you get improved switching speeds, better performance with less power from the driver, lower gate-to-drain feedback capacitance, lower thermal impedance for higher switching frequencies Variable Low-Pass Filter - A low-pass filter is an electronic circuit that removes all the notes below the filter's frequency setting. You will use the Low-pass filter to primarily keep high notes out of your subwoofer(s) High Level Inputs - Speaker level inputs are commonly referred to as high-level inputs. It will be used to connect the P10AW to your factory radio or an aftermarket radio that does not have low-level (RCA) inputs Low Level Inputs - Line level inputs, also known as RCA inputs or low-level inputs, use RCA interconnect cables to link the P10AW with the source unit. Most aftermarket radios have multiple pairs of RCA outputs that can connect to multiple amplifiers