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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.
Headroom, properly, means how much more clean volume you have until clipping sets in. An efficient speaker will increase the amp's headroom by allowing the amp to be louder at a particular wattage output. A lot of people incorrectly use it to refer to the point on the volume knob where the amp breaks up. - Scott.