What about the Accuphase P20 with its user selectable damping factor?
We know that people prefer louder signals so you can easily trick someone into preferring identical setups if one is slightly louder. It is why volume matching is so important in tests. We also know that FR irregularities are masked in stereo.
What we don’t have quantifiably is how the stuff balances out. If I lose 1 “point” of FR accuracy but gain 2 points of bass extension and 2 points of loudness, I will prefer it.
High efficiency speakers tend to compress less. Is there a scenario where the combination of higher SPL from fractionally less compression overcomes the preference of neutrality? All this talk about distortion has to be balanced with the idea that we perceive distortion as loudness…