I was already familiar with the HOFA Absorber ECO, so I knew what to expect from this product. It is a wrapped Basotect foam in a nice wooden frame. The foam is thick so it delivers as expected, but rolls of quickly below 250Hz. I combined it with HOFA diffusers as I didn?t want to kill the wall completely but rather catch the early reflection point and diffuse the rest. HOFA is very clever this way as you can play with the same sized components like puzzle pieces.