It's not perfect, but it still makes more sense to me than the half-glass one, because it relies less on the speaker and listener having the same interpretations and emotional connotations for 'half full' and 'half empty'.

That said, I'm taking it as a description by way of charicatures, not as a literal prediction of behaviour.

Personally, my vote is with the audio engineer: "The glass has 6dB of headroom." (Or is it just 3dB? I forget.)

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