An idea came to my mind right now.
When people talk about Sabine absorption coefficients, they usually transform 0.08, 0.20, 0.70 readings into percentage (8%, 20%, 70% of absorbtion). If percentage values are exact estimates of how much enegry surface absorbs at a given frequency, then transforming it into Impulse Modeler decibell form is very easy: 20 * log( 1 - Coeff ) / log( 10 ).
Relations between Sabines and IM decibell form can be more complicated, but right now that's the only way I see they can be converted.
On the other hand, Sabines above 1.0 are simply invalid (strangely enough, I've seen them somewhere).
So, the formula I've provided above can be correct.
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