Acoustic Foam Bass Traps -12 Pack Wall Corner Studio Foam Blocks 12" X 7" X 7" Low-Frequency Sound Absorption Material for Home Studio and Theater etc. (12 Pack, Bass traps)

I tried all the methods (wait 24hrs, soak and dry, blow dryer, machine dryer) to get these to expand but I realized its not a problem with expanding, these foam blocks are just made unevenly. The dimensions say 7x7x12, but they all come out to 6.3-6.8x7x12 (each dimension being +/- 0.2 inches) and the problem is that the side that is shorter is not consistent so if you are trying to line these up to look nice, it just wont happen. I found the best way to mount with this problem is to add double sided tape to each corner and stretch out the corners while you're mounting them to line up with the previous block. I won't look perfect but its a lot better if you just pushed each block into the corner and mounted it that way.

These did the job I needed them for, and were very inexpensive so I'm keeping them in place. They're not very even in the way they expanded from their vacuum packing so they don't look very good, but since they're not super visible I don't mind too much. They do even out bass response without sucking the life out of the room for me, so in that regard I'm happy. (The foam is not very dense so they don't offer much in the way of midrange absorption, but that's not what I wanted them for.)If you want something that's more broadband in absorption and/or looks crisp, look elsewhere. If you want a cheap solution that may help even out bass response and don't care much what they look like, these are a pretty good value.

These bass traps are excellent for taming bass frequencies in a home studio setting. I noticed a huge improvement not only in my listening position, but throughout the entire space as well. The bass response no longer drastically changes when I take a few steps back from my studio monitors. As someone who frequently masters music, this was a huge win!While a few panels did arrive slightly damaged, Amazon took care of me and made it right.

So I had these (bass traps) before buying panels so I didn't appreciate how these almost immediately rise. The panels needed water, these bass traps didn't. Worth it.