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Here are all the possible meanings and translations of the word headroom. Princeton's WordNet(0.00 / 0 votes)Rate this definition: headroom, headway, clearance(noun) vertical space available to allow easy passage under something. headroom, dynamic headroom(noun) the capacity of a system to reproduce loud sounds without distortion. headroom(Noun) the vertical clearance above someone's head, as in a tunnel, doorway etc. headroom(Noun) the ability of a system to reproduce loud sounds free of distortion; dynamic headroom.
Best Answer: Headroom doesn't have to do with audio, or the seat cushion, or your head. Headroom is the space from the top of the head rest on your seat while it is in it's full upright position to the ceiling. So those other answers are wrong. In a digital audio system, headroom is the amount by which digital full scale (FS) exceeds the permitted maximum level (PML) in dB (decibels). The EBU specifies a PML of 9 dB below 0 dBFS (-9 dBFS), thus giving 9 dB of headroom.