BXI Sound Absorber - 16 X 12 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

it works if you put very close to the dr gap, improving the isolation of the sound .

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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.

These BXI sound absorber panels are surprisingly effective at reducing echo and background noise in small to medium-sized rooms. The high-density foam feels durable and the 16 x 12 x 3/8 inch size makes them easy to arrange in different layouts. They’re lightweight and simple to mount with adhesive strips (not included), though they may not stick well to textured walls. The black finish looks professional and blends nicely into studio or office setups. A solid choice for improving acoustics without breaking the bank.

Buen producto pero son pocos por el precio 🙁