It’s often interesting to read some of the forums on acoustics (Gearslutz etc.). Some of the comments are informed, and many seem to possibly have an undisclosed agenda. Marketers are well aware of the power of opinions expressed on forums. Acoustic foam (also Auralex, Primacoustic, etc) has it’s fair share of proponents, but also comes in for plenty of criticism. Many state that acoustic foam will not absorb low frequencies, which is not the case. I’m pretty sure this criticism mostly refers to thin acoustic foam like eggshell foam etc. An acoustic foam panel of the correct design, density, composition and thickness is very effective at absorbing low frequencies. Our own SA600-150, (which is 150mm thick) has an absorption co-efficient of .6 (60%) at 100hz and 100% absorption at 200Hz, as demonstrated in the test performed at the certified lab at RMIT. The main alternative to acoustic foam are home made panels using products such as semi-rigid fibreglass or dense polyester panels. The performance of these panels are similar to acoustic foam panels, but again, thickness of the panel is directly related to the low frequency absorption.