Harman uses juries of "trained" listeners to evaluate its products and to participate in audio experiments (Dr. Olive and his mentor Floyd Toole are prominent i

Harman uses juries of "trained" listeners to evaluate its products and to participate in audio experiments (Dr. Olive and his mentor Floyd Toole are prominent in the field for their audio listening experiments). The "How to Listen" program is a tool that Harman uses to train its listeners. But they also make it available for everyone to train their ears. So the answer is "all of the above."