Crunch PowerZone P900.4 450 Maxx Watt Power A/B Class Four-Channel Amplifier (Black) 4 x 115 W at 4 Ohms, 4 x 225 W at 2 Ohms, 2 x 450 W at 4 Ohms Maxx Power High-Pass Versa Cross X-Over Adjustment 60Hz to 1.2kHz, Low-Pass Versa Cross X-Over Adjustment 30Hz to 250Hz and Stereo / Mono Amplifier Mode Switch Bridgeable Designs with Hi-Level Speaker Lead Inputs for Receiver such as OEM Radios Lacking Preamp Outputs, Amps Configure to 3-Channel Right and Left and Sub Mode, Daisy-Chain Line Outputs and Oversized Speaker Terminals Rugged MOSFET Pulse Width Modulation Power Supply for Instant Maxx Power Output Amp Protection with System Diagnostics LEDs Protect Against Current / Amperage Overload, Short Circuits, Thermal Overload, DC Offset