Planet Audio provides a Powerful 3 Year Platinum Online Dealer Warranty so long as the purchase is made through . We strongly encourage professional installation of this product to ensure proper and safe functionality. Specs - 12.2” x 8.9” x 3”, 8.8 lbs. Phase Control - Phase control lets you adjust the speaker phase with the amplifier depending on the location of the subwoofer. This will avoid possible sound cancellation depending on the setup. 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. Variable Bass Boost - Variable Bass Boost allows you to adjust the low bass within the boost range to just the way you like it. High & Low Level Inputs - A low level (RCA) input is measured in voltages. A high level (+/- wire) input is measured in wattages. Both essentially carry signal from your receiver to your amplifier to your speakers. 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). 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. Built-in Amplifier – Low-Profile Subwoofers that are amplified do not need an external source and are generally very compact.