mdsimon2
Major Contributor
I know I'm jumping into this late, but measurements at 5 watts/1kHz seem much more relevant to typical home listening conditions than measuring 200+watts at 10-20kHz, which, if actually delivered to a typical loudspeaker, would instantly blow out the tweeter, not to mention your eardrums.
These tests are interesting and show a potential pitfall of Class D designs for professional amplification where you might actually call on an amplifier to deliver that kind of power at those kinds of frequencies but these tests seem totally irrelevant to the typical use cases home audio Class D amps are designed for.
Surely you read the parts of thread where measurements were made at various levels and frequencies?
Most interesting to me is the rather noisy spectrum with no input as seen in the THD+N vs level sweep. Maybe it isn't there with an actual electrostatic speaker but would love to see the measurement.
@AdamG247 You said you have ESLs with a NC502MP, any interest in making some acoustic measurements?
Michael