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In contrast, with class D/switching amplifiers, I find that they are exceptionally good at bass so the above test doesn't work. Instead, focus on clarity of high frequencies as you increase levels. Use content that has isolated high notes to make this easier.
A lot of speakers that are rated "4 ohm" actually are rather at 8 ohm or 10 ohm in the highs, so the raising of distortion in the highs is not as bad as it would seem according to the graphs, I think (distortion is usually worse at 4 ohm than at 8 ohm).