Russound X75 2-Channel Dual Source Amplifier The X75 is a 2-channel dual source power amplifier with autosource switching. The X75 is a Class A/B amplifier rated at 75 watts per channel into 4 ohms, and 60 watts into 8 ohms. Automatic switching between two sources with signal sensing Built for multi-speaker applications with volume controls Front panel volume and balance controls Channels are bridgeable to create one channel with 160 watts of power