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AD/DA- SNR vs Dynamic Range

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Hey ive been looking into converters for my new master/slave setup. Mainly lynx e44, Mytek Liberty, UA Apollo X, and RME ADI-Pro. The tech specs for the ADI sites SNR, not dynamic range like the other 3 units.

Just wondering what the difference between the two specs was, and why SNR/DR seems to be such an important spec to adda's.

Thanks.

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.

Dynamic Range

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Dynamic Range - The difference between the loudest and quietest signal levels in a system. In an audio device, usually the difference between the maximum output level and the residual noise floor. In a digital system, the available dynamic range is determined by the data resolution, about 6 dB per digital bit.