Soundstream RN4.1400D Rubicon Nano 1400W Class D 4-Channel Amplifier Rubicon Nano 1400W Class D 4-Channel Amplifier RMS Power Range: 125Wx1@4-ohms / 175Wx1@2-ohms / Bridged: 350Wx1@4-ohms Maximum Power: 1400 Watts MOSFET Power Supply w/ Audiophile Grade IRTM Transistors Hybrid Aluminum Alloy Heatsink for Optimum Dissipation