Thanks. The wall color is a lot darker that what it looks here. More of an orangish red. It's called "clay pot". I can see the clay pot color here in the light of the flash, but the wall doesn't look that color at all.

If you can see the 2 small nail holes I made directly under the middle of the tv a few days ago. It's where I pushed 2 nails, from the room below into the corner of where the downstairs stud meets the header before it turns into the next floor up. (Notice the stairs on the right only go about 40 inches up to the next floor.) This tells me how far down on the wall to mount the tv. I'll have to remove that stud from the room below to make room for the W100 speaker.(It's not connected to the one I mounted the tv on.)