We sat in a room and listened/watched things. We were told you're now listening to number 1, and gave our opinions on paper making notes. We rated the device on a 1 to 10, but not until we had heard each one, and the process was repeated.

The numbers for the units changed with only the person running the test knowing which was which. We couldn't see the units.

At the end we xeroxed our results. Then he handed out a Key that let us know which unit had which numbers. So the 990 had numbers like 4, 9, 14, 15, etc. We used the key figure out the scores for each unit. The Xeroxes went to an impartial 3rd party who double checked the results. This same person made sure that the units were actually playing when we were told "unit 12," for instance.

I don't know how anyone could have seen thru the test.