[ricardojoa]

Hi, do you guys think that panels of 2 inch thick  of 6'x7' area would be too much for behind tv wall? I wanted to do a larger area but thinner panels because i wanted to use the panels as a feature wall as well. But i am afraid they will cover too much area absorbing too much highs.

[Russell Dawkins]

I think the more absorption the better on the wall behind the screen - the front wall. I also favour liberal absorption (within reason) down the side walls, ceiling and floor past the point where the first reflection occurs. In short, I like LEDE rooms (Live End Dead End) with the live end from the seating position back and the front dead. I make the live end dispersive and irregular.

[Ethan Winer]

do you guys think that panels of 2 inch thick of 6'x7' area would be too much for behind tv wall?

If you have regular box-type speakers that send sound forward, then you'd do much better to treat the reflection points than the area behind the speakers. More here:

Early Reflections
Front Wall Absorption

However, dipole speakers send sound equally front and back. So with those, absorption on the front wall can increase clarity. But it has to be thicker than one or two inches for best results.

--Ethan

[bpape]

if it's a multi-channel situation, the front wall should be 100% dead. 

Now if it's just 2 channel, what is necessary or helpful would depend on what if any phase anomalies you're getting from the boundary interaction.

Bryan