Originally Posted by AustinJerry
Unfortunately, due to the shape of your room, and the sloping ceiling, I am not sure that this helps very much. It does show that you have a first-order standing wave at 47Hz associated with the length of the room. Moving the couch forward may alleviate this somewhat. You seem to be sitting pretty far away from the screen. How large is that screen? And the distance to the left and right speakers could be closer to the equilateral triangle if you move the couch forward.
Here are a couple pictures of my our family room that I posted before on the other thread. Till a month ago this used to be what we called the "mud room." My wife's happy to have the TV/speakers out of the living room, and I'm sure happy to be able to crank my music after the kids go to be since I'm now on the opposite side of the house.
The pictures were taken before I put up 2' x 3' 4" absorption panels on either side of the couch as well as the clouds. I also put heavier polyester blackout curtains up. Come to think of it, I should measure the ETC with the curtains open and closed to see if this really made any difference. My ears tell me a little.
I will try moving the couch up, but it would be a awkward to do this more than a foot. I know it is not considered great to have the couch so close to the wall. I may actually consider putting a panel behind the curtains in font of the window. I will measure this. Assuming the ETC is what to look at here? My main thought though is still to build two 2' x 4' 4" absorption panels on either side of the back wall. I will try angling them out a bit to create the air pocket back there. Or I also am considering framing them with a 6" width wood so a air pocket will be created that way. Not sure if that's enough space to do much good.
The way I'm thinking now, I will most likely look at another PB-1000 sub in the next few months. Seems most people here think this will make the most difference, which makes sense to me. My only hesitation is that the corner to the right seems to be such a crappy place to put a sub that I do wonder if this could be counterproductive. Still, my thinking is that this would make more of a difference to SQ than moving to XT32. (Of course I'm sure some people might look at that picture and think I'm out of my mind to consider a second sub with a TV that old, but hey, I'm more of a music guy than movie. A new TV will come too.)
This week I will definitely try out the blocking technique when I spare moment. Thanks for that, Jerry. And thank you to everyone who has helped me here.