EQ Acoustics Spectrum 2 L5 Tile Natural

For the buck you get great panels that will help you get rid of the fluttering echoes in your room. I think these are probably the best panels money can buy if you don't want to make them yourself of course. I would recommend to cover at least 10% of your room with these panels.

My only issue is although I keep buying the same color the company slightly changed the color profile of the panels so they do not match my older panels 100%. But I can live it :-)