QTR-Quadtone RIP

>...
> Does anyone have the experience of interpreting the 
> L value and therefore getting the dmax?

Not sure if this is what you're after, but at 
http://www.brucelindbloom.com/ Lindbloom has a calculator program that
translates between L and D.  Go to the above website, click on "Calc" at the
top and then "Companding Calculator."

Paul
www.PaulRoark.com