Here you go. Top line is off, then Depth 10 - 0 (gain 50, bass toTreble 0) . Looks like once you get down to 15Hz and lower the white noise is a little less stable.
But it gives you the idea.
EDIT: If you want a bigger chart with compensation for the drop in signal, from 600Hz up, let me know. But that'll take a little while to knock up