Audio DiffMaker is a freeware tool set intended to help determine the absolute difference between two audio recordings, while neglecting differences due to level difference, time synchronization, or simple linear frequency responses.
The difference recording that results is only what has changed between the two recordings. If anything - a change of component, a treatment, mechanical damping, etc. - is having any audible effect on the audio signal in a system, the difference recording will have audible content. The end result is primarily intended to be evaluated by ear.
Changes detected by Audio DiffMaker are not necessarily audible changes for any given person. Some changes will not sound different, and some are too weak to be heard when accompanied by the unchanged part of the program material. But a silent difference track can only result if the two tracks being compared are unchanged (the same).
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