Out of phase means ONE speaker is wired 'out of phase ' with the other one.
One other point is the dealer may have been asked to demo the lesser speaker in advance for that customer by phone. And the dealer deliberately set them up 'bad' with out of phase ,and some poor electronics ON PURPOSE to get the interested customer to move up the line. I have known dealers who were never above such a tactic. On the other hand I have known dealer salespeople who could not hear the difference either.... And perhaps the just set that pair up near the more expensive ones in a rush for that customer?My main current dealer is adverse to 'moving things' in real time. But will do so in advance, if asked in advance.