I installed the surround speakers of my DVD entertainment system today. I'd been holding off for a while because I was going to have to take the wires up through the insulation-filled attic and drop them down through the ceiling into the great room, which is an outside wall. I have vaulted ceilings which are high on one side and low on the other. Needless to say, getting to the low side to get the wire was very difficult. I was prone across the ceiling joists and the roof nails were almost touching my head.
Now to the point of all this. I installed the mounting brackets on the wall
91" from the floor. I checked and double-checked the measurements. I even measured from the wall railing to make sure. After I attached the speakers and adjusted them evenly, I (and wife) noticed the left speaker was lower than the right one. The left one has the high wall and the right one has the low wall. I got out the measuring tape and checked it again. To the bottom of the mount was exactly 91". I tried adjusting the speaker on the bracket and still couldn't get it to look right. I swear it it was a good 2" lower than the right speaker. I ended up having to remount the left speaker higher and later filling in the extra holes.How can this be? My floors aren't that unlevel. I am on a concrete slab.