As early as 1962 more than 0.5century ago the BBC was worried of TV speakers becoming smaller and smaller [BBC] and placed at the corner making the sound out of the actor's ear syndrome.
Physics or nature needs a larger size for speakers. It is frequency, wavelength related by the speed of sound in air. Speed of sound is wavelength x frequency. The lower the frequency the longer must be the wavelength.
The small Pleiades cube derivatives of Auratone 5C sound very nice and by today's standards are big.
Reference:
The broadcasting of music in television - BBC Minograph 40
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