Harman International uses a automated speaker shuffler for their double-blind listening tests which allows for room effects to be effectively accounted for. This eliminates positional biases in the speakers. They do not fool around in R&D. You will rarely see this much attention to detail taken in blind listening tests of speakers.

Most that claim double-blind tests (review/audio sites and such) are most of the time just blind (the listener).

I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne