The Eyring and Sabine formulas that EASE and EASE JR use to calculate the rooms RT times are a single set of RT times for the room and don't reveal the differences in RT times that prevail in an actual room. The formulas are also generalized that aren't accurate for every room. For example, they assume the room's absorption material is distributed homogeneously on the room's surfaces, a condition that doesn't exist in many rooms.

Local Decay Times, an EASE feature, provides a quick check on the accuracy of the formulas as well as providing RT times for specific locations within the room. It uses an omni-directional source to distribute rays throughout room and calculates the RT times for pre-selected locations within the room from the ray's decay times. The result is RT times that are more "real life" figures.