I think you missed the point. They don't need to measure again. They just have to deduce if Susvara sounds worse than the IEM.How is this to be achieved? Each member has to invest in expensive testing equipment and then learn how to operate it? You start.
If they think that it isn't true, then they won't believe that the methodology in ASR accurate.
All they have to do is to listen to both Susvara (in-store) and the IEM.