So we have:
Low feedback means less extension in frequency of harmonic distortion product generation. This means less likelihood of slewing related distortions, and less "noise modulation", especially in the high frequencies. Balanced topologies don't generate much if any even harmonic distortion product, so there's no 2nd harmonic, which is very arguably the most (or only) desirable of the distortion products. Slight AC imbalance in the push-pull output stage means you get a 2nd harmonic distortion product that dominates over the 3rd. The ideal would seem to be low or no feedback, and avoiding a perfectly balanced topology
Last edited by RCruz; 23rd November 2012 at 08:44 PM.