When I run a plugin THD+N test on a repaired and refurbished NAD 3020e amplifier which has a rated output of 20W <0.05% THD I get the chart below. Even though the spec is without noise, obviously I was a little disappointed and assumed something wasn’t quite right with the amp.
However, on the main screen, if I do a direct test the amp does indeed manage to output over 20W with 0.002 THD / 0.005% THD+N.
Am I doing something wrong?
I’m using the latest stable S/W with a QA401 and QA450 as the dummy load.