@jerryg123 no, he is saying he is hearing a difference, so I have no doubt about that. Is the speakers outputting something different? No they are not, it is physically impossible for these gizmos as you call them to change the output from the speaker. Hearing is an interpretation of the reality based on many many things.
these companies hate when you do a full spectrum analysis of the speaker output, but very few people do those types of reviews.