All the details of FET400 Mosfet amplifier circuit diagram, PCB, layout description and high resolution images (hq) have 8 ohm speakers with 263 watts RMS and 350 watts into 4 ohms 6 ohms and 406 watts rms power can... Electronics Projects, FET400 Mosfet Amplifier Circuit 400W "audio amplifier circuits, transistor amplifier, " Date 2019/08/03