Two reminders: Tutorial - Interpreting THD and THD+N specifications and graphs Tutorial - A tale of 6 amps THD+N and THD specifications Chasing numbers is a fool's errand. They are lossy compression equivalent for technical measurements with an enormous quantitative data reduction. Consider the following three amps THD+N, taken from their respective Left channel technical measurements posts: THD+N Left channel 0.002% Liquid Platinum 0.006% Lyr3 0.009% DSHA-3F Those numbers are all respectably low and don't appear to differ by much. Now consider 50+7000Hz FFTs for the same three amps at approximately +3 dBu: 50+7000 Hz Liquid Platinum 50+7000 Hz Lyr3 50+7000 Hz DSHA-3F Those three amps have quite different FFT signatures. Measurements matter, when you know which ones are worth comparing. When chasing numbers the assumption is lower is better. I don't believe that is a good protocol. Looking at FFT signatures one might wish to find amps with signatures aligning with personal preferences. A superior protocol.