Devialet Expert isn't good in showing secondary harmonics?

[Damon]

I too would think that the 'secondary harmonics' item must be distortion; One of the frequently mentioned strengths of the Devialet expert amplifiers is that they are exceptionally revealing. They don't have tubey 'bloom' to the midrange, which many persons like. Although the science and math of it is beyond me, I understand that some harmonic distortion modes are pleasing to the ear. That too could be the harmonics your acquaintance is referring to.