Focusound 4 Pack Bass Traps Corner Acoustic Foam Corner 16.5" X 6.3" X 12" Acoustic Foam Panels Soundproof Padding Wall Panel Corner Block for Home Studio and Theater

Before buying these, I read pretty much all of the reviews. Most were positive, but there were some negatives. I bit the bullet and ordered them. They're up, and here are my thoughts:1. People complained that many of their tiles never expanded. Yes, they come squished tightly together in vacuum sealed bags, and that flattens them rather effectively. However, I immediately dampened my tiles under the faucet, wrung them out, and ran them through the laundry drier. They popped right into shape. No issues. There were some that were more squashed than others, and I set those aside to see what they did on their own. Two or three hours after unpacking, they weren't quite as thick as the ones I dampened and dried, but still about 90 percent back to their intended thickness. They were fully expanded the next day. Considering the instructions say to give them a day or two, that's pretty good in my book.2. Others say their tiles smelled weird. Mine didn't. At all. No smell that I could detect.3. A handful of reviews claim their tiles were cut at wonky angles. Mine were perfect squares. I ordered the 50 pack and all 50 have 90 degree corners.4. More than a few said the double-sided tape for hanging up the tiles didn't work for them. I have had zero issues so far. I think it depends on (a) how much pressure you use in pressing the tape to the intended surface, and (b) the type and cleanliness of the surface you're sticking them to. Tape sticks better to some surfaces and not so well to others. In my case, the surface is raw cedar paneling. Also, if there's any dust or smoke residue on your walls, the tape won't adhere to it very well. So I'd strongly suggest making sure the surface is clean before trying to stick things to it. And give the tape a good hard press when applying it to the wall. It helps ensure adhesion to both the hanging surface and the tile.5. Some reviewers complained that the tiles don't block sound. News flash -- acoustic paneling isn't meant to STOP sound. That's what wall insulation is for. It may help DEADEN sound, but that's it. I bought mine for a 6x8 recording studio. I have curtains, soft furniture, and a thick area rug to help deaden sound and cut echo, but the cedar panel ceiling was echoing and I had to eliminate that. I started with 25 panels on the ceiling above my recording equipment. That equals two thirds of the ceiling. As soon as they were up, I recorded a minute or two of test audio, and voila -- the echo was almost completely eliminated. Not bad, if you ask me. I plan on putting up the rest, but I'm done for now. I'll update when I have the rest of the setup completed.For my initial impression, I'm giving it 5 stars.UPDATE: 1 week later, here's my report. The day after installing the tiles, one of the tile had a corner come loose. I pressed it back up and it stayed. No adhesion issues since. I have also tiled the rest of the ceiling and my echo issues seem to be pretty much eliminated. So my 5-star rating remains intact.

I'm not sure why there are so many negative reviews on this.I ordered an 80-pack for my office for decorative and functional purposes. I had no issues with them filling to full size, in fact, the second I broke the seal on the vacuum pouch, it was nearly impossible to remove them from the packaging. Once I got them out of the packing, I stacked them in stacks of 10-15, and let them sit for about8 hours. Then placed them on the wall without any issue, the only part that sucks is having to manually place the adhesives.Yeah, they aren't STUDIO QUALITY 3in foam panels, but that isn't what is described here. They do function well despite the naysayers. I have no issues with the product falling off the wall, and no issues with a smell either. My bet is most of the negative reviews come from people trying to get these to stick on powdered/heavy textured walls. And, of course, with ANY adhesive going on your wall, there is a chance that it could damage the paint/drywall when you attempt to remove it.TL;DRPros:-Cheap-Functional-Easy to Install-Looks Great-Easy to Cut to Size-Cuts down EchosCons:-Time Consuming Installation-Lots of Trash (From the Adhesive Stickers)Overall Good, and easy to install. Definitely worth the buy if you don't need perfection and 100% noise cancelling.

I wanted to soundproof a room that was excessively echo-ey and could practically hurt your ears, and these helped. They are all a uniform black which is nice so there arent strange odd ones out, and the ridges on them help capture sound more than just a sheet, blanket, or rug. They are thinner than I anticipated, as the measurement is from the tip of a triangle point and down to the flatside, so the dips between the ridges are super thin, so they arent going to be durable if youre looking for that. I like the size of each one being a square foot, it makes them easy to manage and move around, but it can get tedious if you need to cover a large area.After placing them in key areas, the difference when walking from one room, into the echo-proofed room, and back, is noticeable. They work well for noise cancellation, and if you have extra, it doesnt hurt to just pile them over eachother in areas you feel noise is gonna be worst, it does help, even if a little bit. I wouldnt recommend these for someone who is looking for the maximum deluxe quality of sound proofing, but they are great for a quick and easy noise-limiting project. I would recommend anyone buying to just get the 120 pack, as they WILL be smaller and thinner than you think, unless you measure the entire space you plan on filling in. Also, I saw other people complaining about some not filling out to their full size due to the vacuum sealing, and this was true for a couple days for mine until I split all of them from eachother and had them spaced out enough to breathe without being stacked on eachother or on something else, and they all filled out to the same size.I wouldnt say these are the greatest things ever, but if you actually want anything like this, and without blowing an entire budget on just this, I would go with this product and the 120 coount just for safe measure and maximum value.