I am beginning to understand how to read headphone measurements to the point where I can look at them and see whether a headphone is warm, bright, etc. Basically if it's worth checking out. On the other hand, when I look at amp measurements like these, I have a hard time understanding how one amp is commonly accepted as warm (eg Violectric V200) or another one as bright (eg Burson Conductor) when all the amps on the page seem to have essentially flat frequency response other than the extremes of human hearing (and less than 1db roll off even at those extremes). Is there a way of reading amp measurements to help decide whether an amp's signature may suit one's tastes? And is anyone doing such measurements for different tubes?