Flatscreen between speakers

Yes but there are now projectors with high luminosity and you don’t have to be in the darkness. Yes they cost more but they are still relatively affordable like with 2k you can have a great 100 inch picture with less eye fatigue 

I see. It’s worth considering. They also seem to be affordable. 

A few observations that I made since using this panel:

I would still use it if don’t have a TV anymore between my speakers. 
It is doing much more than removing the glare or whatever the glass was adding to the equation. 
It can be configured with a combination of absorption and diffusion to resolve particular issues in different situations. Mine has very few absorbing tiles (3).
It probably would look better using white tiles. The black tiles look kind of austere for lack of a better word. But that’s probably a matter of taste. 

I am planning to use a pull down TV wall mount that is built to allow a TV mounted above a fireplace to be pulled out and down. 

Instead of mounting a TV on it, I would mount a diffuser slightly larger than my TV that would be above the TV when I am watching television and would swing down to cover the Tv when I I am listening to music.

My only concern is that the TV would be too far off the wall when is is the down position. to that end i am still looking for one that swings more "down" and less "out".

@tony1954. You might have to build whatever you want. Set your design parameters then solve them one by one. Mine were that the gadget be light, not expensive, functional and elegant. I have achieved all of them to varying degrees. Some were even exceeded. Like I said, you might have to create it yourself. Good luck.