The tests here although useful extra data are not representative of the performance in driving subwoofers which is the typical usage of such amps. Almost every modern high power PA amp cannot sustain maximum power forever, they are limited by the power supply and or thermally. In actual usage this is not an issue as all music must have some dynamic range so even the most sustained sine wave bass lines only last a few seconds. Tests of output power over time like this: http://data-bass.ipbhost.com/topic/917-robs-amp-tests/ are way more useful for the intended application than finding the inflection point in the THD+N graph with a long duration sweep. The power tests that are done at ASR are perfectly applicable to traditional class AB amplifiers where the limiting behavior is caused by the voltage of the power supply rails but are insufficient to characterize amplifiers with complex limiting characteristics.
if you look at the datasheet of a high end touring amp you will see that the available output power is dependent on many factors and peak to avarage ratios of input signal:
https://www.powersoft.com/wp-content/uploads/2019/07/powersoft_TSeries_DS_EN_WEB.pdf
if you look at the datasheet of a high end touring amp you will see that the available output power is dependent on many factors and peak to avarage ratios of input signal:
https://www.powersoft.com/wp-content/uploads/2019/07/powersoft_TSeries_DS_EN_WEB.pdf