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Old 15th August 2020
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