I believe THX has a recommendation and SMPTE does as well. I know the THX spec suggests sitting closer than the SMPTE. Sorry no links.
YOu are going to laugh.
REcall our conversation on the phone today regardinmg Generators.
Well, my first patient of the morning and I got talking about the power outages in our neck of the woods and he told me he had a generator. I asked him what size and what size house as a reference (mind you I have treated this fellow a few times before). Well, to make a long story short, his business is midwest and southern generator distributorships. So, I asked him about the the 25kW Generac (he uses a 30KW Generac on his 10K sq ft home) and he said the size is right and it should last forever (he carries all brands). So, he's gong to sell me one at his cost