A low sensitivity speaker comprised of a relatively small mid-bass driver in a small cabinet is not going to overcome the laws of physics. Even if Harbeth uses Houdini cloth for their diaphragm material when the same driver tries to reproduce a 45Hz and 1.5kHz signal at the same time there is going to be problems with transient response, frequency and amplitude modulation distortion, and thermal compression, especially if you want to listen to music at realistic sound levels.
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