DIY acoustic panels?

Sleepstalker, the man who eats his own poop, strikes again. 😋

FWIW, I tried the DIY approach to making absorption panels and then I  tried GIK's products. Considering the time expended and cost of purchasing quality materials to make DIY panels of equal quality to GIK's, I can't imagine why anyone would bother unless you just enjoy experimenting to occupy your time. Their products have an outstanding price/benefit ratio. They will also give you guidance on the best products for your project. 

You asked if the expanse of television glass affects your audio quality. Yes, big time. Getting rid of the tv between my speakers was one of the best things I ever did. Unfortunately, many of us have to compromise and combine AV and audio in one location. In my past experience, acoustic panels in front of the tv help some but don't entirely ameliorate the bad effects of the tv. 

Look up ATS Acoustics, Piper City Illinois. I built several panels using their products. Have a good website.  

As a follow-up to my last post. I purchased from ATS: 1 box Rouxul Rockwood 60 panels 2", and Burlap fabric. I purchased 1 x 3" pine boards and hardware to make frames. I built 6 panels for the price of 2 pre made by ATS ($114). 

My listening room has to serve multiple purposes. And my wife is not going to let me put anything ugly or even technical looking on the walls (not that I want to either).

Ceilings are 10’ so I’m not messing with them. Left wall is 1/2" thick wood paneling but is mostly take up by two windows with heavy drapes. Back wall, behind listening position is all window, but again, behind heavy drapes. Wall behind system will soon be all books. The right wall is the issue. Solid brick. There are two areas, 4’x8’ that probably need attention. My plan is to hang oriental rugs over the brick in those places. Wife is okay with that idea and she will source the rugs. She knows where to get nice looking, older, but not high end rugs for the purpose. Still probably several hundred a piece.