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A Simple Headroom Test

With the possible exception of Pro Tools (maybe not now that its gone native?) all modern DAWs use floating point math internally. What this means is, when the signal exceeds full scale it doesn't actually clip: instead the decimal point simply floats along a step, and the mix bus suddenly has room to accommodate it.

Headroom Explained?

Can anybody example the concept of headroom and give any suggestions on to gaining some more headroom with my tracking chain?
My chain is:
RODE NT1000 --> PreSonus TubePRE --> dbx 266XL --> Mbox 2 --> Pro Tools LE (Windows Vista/ 2GB RAM)

Someone said that I was having some tracking issues and the lack of headroom was one of the issues.

Headroom

The difference expressed in dB between the nominal operating level of a device, and the maximum level that can pass through the device without being distorted.

or

The distance (in decibels) between the nominal level of a piece of audio equipment ("0" on the meter) and the clipping level, at which point it distorts.

understanding headroom -- dBv, dBu, VU primer ?

Reasonably new to this. This question arises from my search for a new/new-to-me preamp to replace my mobilePre
(which, not surprisingly, doesn't provide tracks which stack particularly quietly).

I believe that I understand the concept of headroom (i.e. - how hot a (mic) signal can the preamp handle?),
but not the measurement units.