Every speaker has a sweet spot, Let me explain my understanding. For speakers to disappear they need to sound the same and be at the same volume, along with some other minor factors this only happens one spot in the room. I find my 5a the sweet spot is actually bigger than some of the speakers I have had in the past. I think because the vandies are so clear and transparant people notice the sweet spot more and notice when they are out of it. I have had several speakers no matter how I tuned them I never really found a sweet spot or got great imageing. But yes they are sensitive to position but that is a aucustical properity that applies to every speaker. I love the fact though that they can be tuned this allows adjustnment for the room and position. Ever speaker should have this feature.