ABSTRACT
The history of audio has had a frustrating tendency to produce ‘undefinables’ in terms of
quality differences. The hi-fi press has invented a whole vocabulary of adjectives to
describe sound qualities, but without objective verification there is no way to know if the
terms mean the same thing to different people, or not. Spaciousness is one obvious example.
In the stereo reproduction of music, spaciousness is a highly valued attribute, yet no unit
