So here's the reason why I can't put in an in-wall speaker. We're building out the basement wall where the TV is going to go. There is a 72" in-wall electric fireplace that sits about 17" off the floor. The TV is an 85" Samsung that mounts to the wall above it. There is a mantel that will separate the TV and the fireplace. Once the mantel is installed, there are literally only a few inches that separate the bottom of the TV and the mantel. All in-wall center channel speakers are about 5 - 6 inches tall. There is literally no room. I've seen Samsung sound bars that are only a couple of inches tall and that would fit, but apparently, I can't use a sound bar with my surround system.
I need to find an on-wall center channel speaker that is very thin. Any suggestions?