what is the headroom in a vehicle
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.