How is it double blind if one person is clearly able to tell a difference when he sets the speaker?
I'm all for beer-based testing sessions, of course. (In fact, right now I've got some organ music playing at earth-shaking volumes after having a few.) But there's nothing especially double blind about it that I know of.
On another note, I'm going to guess that certain rooms can tolerate this a lot more than others. Specifically, those that are kind of poor for sound in general. In them, horizontal vs vertical probably matters a lot less, as a (total guess here) 10% reduction in quality in a room that only lets you achieve 50% quality anyway is much less noticeably different than a perfectly engineered room.
I'm a bit tipsy though, so noone should put any money behind my guesses and/or logic.
