NAD C298 for your consideration
Power amplifiers should be boring. They have a single, well-defined function: Make the input signal large enough to run a loudspeaker so that it makes sound at levels suitable for listening to music. Generally, controls and features are few or none. Peter Walker of Quad famously defined the...
www.stereophile.com
“With both channels driven and clipping defined as when the THD+noise in the output reaches 1%, the C 298 clipped at 275W into 8 ohms (24.4dBW, fig.5) and at 510W into 4 ohms (fig.6, 24.1dBW). … The C 298 is one of the lowest-distortion amplifiers I have measured, rivaling the less powerful Benchmark AHB2 that KR reviewed in
November 2015.”