Holton Precision Audio Mono Bloc 500 Supreme Power Amplifier Custom made to order mono block class A/B power amp based on the Supreme 500 stereo amp. https://holtonprecisionaudio.com/ 300 Watts RMS into 8 Ω 500 Watts RMS into 4 Ω 800 Watts RMS into 2 Ω It operates in class A for the first 5 watts or so. Printed circuit boards use the ENIG Gold Immersion. This helps make the amp sound better for longer as it stops oxidisation of the circuit board. Power supply is the same as the stereo 500 supreme except for the size of the toroidal power transformer. In this mono block it is 1200VA. Made