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It may be that melanin, the best sound absorbing material known
melanin is the best sound-absorbing material known due to strong electron-phonon coupling.
A really good - quality 'free field' room or sound studio has very thick walls. 'Egg boxes' are just not good enough.
Plus very massive walls!Once your loudspeakers have produced a good 'thumpy' level of low frequency sound inside your room it will tend to get through everything but a good heavy concrete box (walls, floor and ceiling) with massive, double thickness doors.
It makes me smile that people are obsessed with flat responses for the Hi Fi stuff they buy and then they take it home and play it in an average room with immense response peaks and troughs - not to mention the traffic outside and the central heating and gas fire - what price signal to noise ratio?