I'm using the Durst M670 colour enlarger and was just about to try out split grade printing for the first time when I came to realize that the filter settings for Ilford Multigrade (says ilfospeed multigrade?) in the manual dont match those given by the Ilford website. Am I not understanding something? my manual for example gives grade 2 as Y36 M46 where as the Ilford site gives Y52 M20.
I side with ic-racer on this one. For split-grade printing, forget the filtration suggestions from Durst or Ilford (they are meant for something else), and work with max Y and max M to get min and max contrast from your enlarger. Mix these two settings for split-grade printing or to get any contrast in-between.