Zapco ST-1350XM II 1350 Watts Monoblock Class A/B ST-X Series Amplifier Class D Monoblock Amplifier | RMS Power/Channel at 4-Ohms: 680W | RMS Power/Channel at 2-Ohms: 950W | RMS Power/Channel at 1-Ohms: 1350W | Max: 2600W Compact Chassis | Strappable | High Current MOSFET Power Supplies Efficiency: 85% | Frequency Response: 10Hz~150Hz | THD at Rated Power: 0.2% Signal to Ratio: 90dB | Tested Voltage: 14.4V | Fuse Rating: 160A Dimensions: 6.3" W x 2.05" H x 12.21" L