Ampeg PF800 Portaflex 800W Class D Bass Head Amplifier RMS power output: 800W @ 4 ohms Preamp: MOSFET Power amp: Class D Tone controls: Bass, mid, treble Mid-tone control: 5-position RMS power output: 800W @ 4 ohms Power amp: Class D Tone controls: Bass, mid, treble Mid-tone control: 5-position