Originally Posted by: Neal WalterHi darkfrett,

This usually refers to the amount of room you have left to increase the volume without distorting.

Technically speaking:
"the amount of decibel output that can be spared from where your signal is, and the maximum signal level without opening distortion into the mix."

from:
http://homerecording.about.com/od/recordingglossary/g/def_headroom.htm

Great! That is easy to understand and defines it so well. I know exactly what you are saying.

Thanks,
df