Hifonics GLX60.4 Gladiator . 4 x 60 Watt and 4 Ohms Amplifier NGSD (Next Generation Super D-Class) Technology on Mono Amps with High Speed MOSFET Output Devices PWM Power Supply with Molded Terminals and RCA Inputs and Outputs One of a Kind Exterior Design that is CEA Certified and has Military Grade PCB Balanced Input on Mono Amps A/B Analog Class Multi-Channel Amps 4/2/1 Ohm Stable Mono Amps and 4/2 Ohm Stable Multi-Channel Amps Link N Sync Capability on GLX2200.1D with Built-in System Diagnostics