Despite the InPoL Legacy operating partly if not wholly in class-A—which means that increasing the current leaving those 4mm speaker outputs causes the amplifier to cool down rather than heat up—I preconditioned the unit by running it at 10% of the rated 100W/8 ohm output for one hour. Over that period, distortion (fig.1) increased slightly, from ~0.047% to a steady 0.06%; this uplift with temperature is a feature of most low-feedback designs. The distortion is second- and third-order in roughly equal measure.