Nemesis V2 is the latest revision of our analog amplifier platform, developed to improve electrical efficiency and power-stage integration without changing the core design approach that defined the original Nemesis. It remains a single-ended Class AB amplifier with dual-rail supply operation, optimized for low distortion, wide bandwidth, and high load control.

The main design update in V2 is a revised current management system in the voltage amplification stage. This circuit was developed to reduce current consumption while maintaining operating-point stability across the amplifier’s working range. In practice, the goal is lower thermal stress and more consistent behavior under varying supply and load conditions, without compromising linearity.

Nemesis V2 also integrates 13,000 uF of power supply capacitance directly on the amplifier board. Placing the reservoir capacitance on-board reduces current-path length, lowers parasitic effects associated with off-board wiring, and simplifies system integration by removing the need for external supply capacitors in typical implementations. The result is a more compact power architecture with tighter local energy delivery to the output stage.

Measured performance remains the central point of the design. THD+N is specified at 0.005% at 1 kHz, 100 W into 8 Ohms, with IMD THD at 0.007% under the same conditions. Slew rate is 60 V/us, damping factor is 4000 at 60 Hz into 8 Ohms, and output impedance is 0.002 Ohms. Bandwidth extends from DC to 1 MHz (-3 dB), with audio-band linearity of ±0.01 dB.

Noise rejection and small-signal performance were also treated as primary design targets. Nemesis V2 specifies 108 dB A-weighted SNR at 1 kHz and 100 W, with 116 dB CMRR and 115 dB PSRR at 1 kHz. Open-loop gain is 95 dB, supporting stable closed-loop behavior and precise control of the output stage.

The amplifier operates from dual rails between ±5 V and ±50 V, with ±30 V recommended, and is designed to deliver 100 W program power and 200 W maximum power. Its low minimum load impedance, high current capability, and very low output impedance make it suitable for demanding loudspeaker applications where control, stability, and predictable behavior matter as much as nominal power.

Read instead about Nemesis [V1]