Larry, that is such a valuable and important point! Regarding transients, you can measure static or steady state response and harmonic distortion, but that doesn’t tell you how well the amplifier will hold up during transients. My power supply modification for the Liquid Spark headphone amplifier really made a sonic difference. I did not measure a before/after, I only listened. Perhaps to run a low frequency square wave and look at the tilt would tell us if an amplifier’s DC supply is a little saggy.