Crunch PowerZone P5000.5 500 Maxx Watt Power A/B Class Five-Channel Amplifier 4 x 125 W + 1 x 300 @ 4 Ohms, 4 x 200 W + 1 x 500 @ 2 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 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