BXI Sound Absorber - 31.5 X 23.6 X 3/8 Inches 6 Pack High Density Acoustic Absorption Panel, Sound Absorbing Panels Reduce Echo Reverb, Tackable Acoustic Panels for Wall and Ceiling Acoustic Treatment

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Work very well, easy to install. I used them to quiet down a clock that is located in a bookshelf, and they absorb quite a bit of the sound that was reflecting out of the shelf area surrounding the clock. These panels are lightweight, and easy to cut with a utility knife. I would highly recommend.

I said these are good in a previous review, and they are. Quality, should be fine. BUT, I didn't realize there is NO BACKING ADHESIVE like ALL other acoustic pads. I foolishly assumed... Great item, but it's HORRIBLY INCONVENIENT not having an adhesive back. Because of that I wouldn't recommend them. Yes, you can use various methods to mount, but nothing is as effective and quick and easy as a pre-adhesive-backed tile. So beware.

Dense and looks nice but i hear zero difference

One of the better quality constructed sound panels available online but very limited in its use. Don't expect any reduction in bass boom for example, just slightly tamed high reflections.