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Old 15th August 2020
  #4
Here for the gear
 

In practice, it seems that most folks put the higher density material on the front of the panel... the reverse of what is proposed here.
I personally had good success using a layer (3") of Safe N Sound (GFR of ~10k) in front of 21" of Pink Fluffly.

These calculators may not be very accurate, especially for more complex scenarios such as mixing materials. BTW, I prefer the Komatsu model over the default model of the online calculator.

To be honest, real life testing is the only to be sure.
See here:
Porous Absorber Calculator.. Accuracy issues?l