Got some accoustic art panels for my rear wall and these are 2 inches thick. I thought it was gonna do some good, but it ended deading the ambience. The panels are working as advertised, but it seems like i lost the ambience that i am used to have without the panels. Good thing is that i havent put them on.
So whats the deal with acoustic panels, do people really need acousctic panels all over their listening room?