AVS Forum Special Member
Join Date: Dec 2003
Location: Bethesda, MD USA
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As someone that's just built a new house I'd suggest waiting until you have the TV and the mount. And then figure out just exactly how you expect to view the TV. This because in three different places I'd placed boxes they all could stand being in slightly different locations. You don't necessarily know where this will be until you've got the gear on hand and can inspect how it'll all come together.
The one TV up on the wall in the exercise room has it's outlet just a wee bit too close to where part of the mount's back plate needs to rest on the wall. I'll have to add a thin box extender ring to it and then put the wall plate over the edge of that plate. It's behind the TV so the look won't matter. But if I'd had the mount on hard to start with I'd have stood a better chance of moving the box just the slight bit needed.
The one for the family room would've been too high. Thankfully the subcontractor that was supposed to build the cabinet for that location flaked (run screaming from Capitol Closets in Vienna, VA). So the new location, about 6" lower, won't be an issue once the cabinetry is installed.
So if you don't have it all on-hand ahead of time, or aren't absolutely sure where you're going to place things.. wait. Old work boxes can be installed very easily after the fact.