How to do Audio Precision sweep THD+N vs Power?

[jasonhanjk]

As title above, how to do it using AP2722? Been doing THD+N & Power vs Amplitude, very hard to read.

Attach an example of headphone amp with 2068 and 4556 op amps.

 

[Audio1Man]

It is easy to read for me. Make a new test GenMon, THD, Sweep 26 volts to 10mv, 500 points. This will show you that the THD% will start to rise below 500mv as the S+N/N is a limiting factor. You see that your THD is FLAT from the 500mv to the 2 Volt level.
Duke