EDIT: I am now certain that the iPad is defective. I will return it. Details in post #8. Got the new 12.9 a few days ago. Everything works just fine, except the sound quality is bad in some cases. I live in a country with no Apple Store, and I haven't seen it at the local electronics stores yet, so I can't easily go listen to another new 12.9 at the moment. The audio problem is a little hard to explain, but I'll try. When playing audio through the internal speakers that hit certain frequencies in the lower end, some kind of resonance happens, and the sound is muddy or rattling. Some male voices hit that frequency, and it sounds like the entire iPad is self resonating, making it a little hard to understand what that person says. A few songs sound bad too. The best example is to find "Jennifer Warnes, Somewhere Somebody" (on e.g. YouTube or just the free preview in iTunes Store) and play it at about 75% volume. It sounds absolutely terrible. Like the speaker unit is rattling around on a glass table. Especially the ending from around 2:38 where she sings "meeeeeeeeee" is nasty. That particular track is a very high quality recording that should sound absolutely clear. Sounds fine on a 12.9 1st gen and other older iPads. Also sounds fine through headphones. Playing at less than ~50% volume is fine. 50% or more is bad. Rotating the iPad around makes no difference. Maybe it's a tad better when the home button is on top, but not a big difference. If one of the four speaker units in the iPad was defective I would've expected rotation of the iPad to make a difference. This seems more like the speakers are ok, but the whole iPad is resonating. Pressing on the screen and/or the back makes no difference. Most other songs and videos sound fine. Anyone else with a new 12.9 have the same experience?