What is your primary goal with the panels - aesthetics or acoustics? You are correct that adding sound absorbing materials to bare walls will improve the sound, but too much may not be a good thing.
Thnak for your advice Ron...do you have any pics of what your wall panels look likeYou can do panels like we are... Some have nothing behind them but the bare wall, and others have acoustic materials. We went this way because we like the fabric wall look, and if we put material behind each panel it would be:
A: too expensive
B: to dead.