The Boss Audio Systems CXX1604 Chaos Exxtreme 4 Channel Car Stereo Amplifier features variable low pass and fixed high pass crossovers and variable input gain controls. For further flexiblity, the amp also comes with 0 to 18dB Bass Boost control that lets you control a subwoofer level with the remote level control module. The very flexible system of controls helps you integrate the amp into your system regardless of the nature of your input source. The Chaos Exxtreme amplifier is designed to operate efficiently at loads down to 2 Ohms, allowing you to install four 8 Ohm speakers per channel if using parallel wiring. Additional features include bridgeable outputs, class a-b operation, MOSFET technology with Pulse Width Modulated power supply, thermal and speaker short protection, nickel-plated RCA inputs and a silver anodized heatsink.