May 7, 1977
SMWTMS did the first ever audio double blind subjective listening tests. An argument over the audibility of differences between amplifiers at a club meeting in November 1976 resulted in an agreement that a double blind test could settle the question. Just six months later, Arny Krueger gave a lecture on his design of a double blind comparator and the first three double blind tests were done. The results include the first three listed in the Power Amplifier Comparison Table in the data. Thus we credit Arny Krueger and his opponent in the argument, Bern Muller, as the inventors of the ABX Comparator. The agreement to create a company to manufacture comparators was informally made the following summer.