Sonic AcousticsFoam Panels - Pyramid Recording Studio Wedge Tiles 12 Pack Set - 2" X 12" X 12" Insolation Treatment for Walls and Ceiling

These are nice acoustic panels that offer pretty good absorbency and break up of acoustic waves. Their pyramid shape not only looks nice but adds very thickness and a regular surfaces to help them do their job. Adhesion depends on what you put on them, I used 1 cm squares of Nano tape in each corner and in the center for each foam panel and that holds them up very security.They can be used for sound absorption in corners and walls, in both medium sized rooms and smaller near field situations. In my listening room, I put one column on each wall, ceiling to floor, at the corners behind each speaker (electrostatics). That was enough to focus the low end considerably. Rather impressed! Recommended.

Do as the instructions said and the foam will stretch out perfectly. Not much unpleasant smells. But it doesnt seemed to work for me, it’s not blocking any sound, maybe if you surround the whole room it will but a pack of 12 won’t do anything. Doesn’t come with any adhesive so you’ll have to buy it yourself.

I really wanted to love these. They come in double vacuum sealed bags. Once opened, I followed the instructions and spread them out, giving them 24 hours to expand back to their normal form. Some did, however; some did not... at ALL. Please see the attached photos. I'm very disappointed, unfortunately. I am returning these tomorrow. Thank god for Amazon's amazing return policy. Big sigh.

Fantastic product. Exactly as described. Not sure why people are having issues with expanding. Soak it in water, ring it out, throw it in the dryer for 20 - 30 mins & voila.I was able to stick them to the wall with stick on velcro strips.Sound absorption is great. Made my home theater sound much better. No more overtones or distorted sounds.

Easy to apply and effective in reducing the sound bounce. Two thumbs up.