Planet Audio P8AW 8 Inch Powered Under Seat Car Subwoofer - 800 Watts Max, Single 4 Ohm Voice Coil, Built-in Amp Package, Remote Subwoofer Control

Built-in Amplifier - A built-in 800 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 PA8W to your factory radio or an aftermarket radio that does not have low-level (RCA) inputs

Phase Control - Phase control lets you adjust the speaker phase with the amplifier if your speakers or subwoofer are hooked up “out of phase”