Fiio q7

[Barralastic]

fiio q7 2nd harmonic:

Second harmonic regulation:
It simulates the special distortion of tube amplifiers. The second harmonic that doesn't exist in the original signal is artificially increased.
Compared to level 0, level 1 adds more second harmonics. If comparing the numbers, the harmonic distortion is about 0.X% for level 2, about 0.0X% for level 1, and about 0.00X% when off.
Note: This function is only effective when the volume is high, for example: in high (or higher) gain mode, the effect will be more obvious when the volume is above 70.