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Sound Isolation Box This is my attempt at a sound isolation box. It basically consists of a box within a box. The boxes are made of 3/4" Medium Density Fiberboard (MDF). I got the MDF from Home Depot. It is a fabricated product that comes in a variety of board sizes. On  the inside (not yet shown) is 1" closed-cell vinyl nitrile foam. I got  the foam from here. They also have a forum that was helpful for my soundproofing questions. I hope I don't have to say this, but I will. Be careful if you're going to be working with power tools. If you're under 18, get permission from your parents and ask for help. If you're over 18, getting help might not be a bad idea as well. Wear your eye protection, ear protection, and lung protection. MDF isn't natural. It has chemicals in it, so you don't want to be breathing the dust in. This is how the board starts. I cut it down on the table saw.  I  cut the panels first to rough size, along the length of the board, measuring then cut, measure then cut. Then I cut each individual panel to the right size. Cut the opposite walls at the same time so you don't have to mess around with getting the size right. The blade and guide will do the work for  you. What's better than power tools??? Don't forget your safety gear!!! This piece is basically the floor of the box. Notice the margin I cut out around the edge. It's about 3/4" from the edge and 3/8" down. This margin helps hold the walls of the box in place. This is one of the longer walls. I cut a 3/4" margin on the end of this on both ends. This will allow the shorter walls to sit securely. This is an example of how the shorter end wall fits in the notch of the longer side wall. Here I've taped the box together. Then I drilled two holes in each side wall through to the end wall.  After I checked to see if the screws lined up, I took it all apart so I could seal the corners. This shows the caulk in the edge. I ran a bead of caulk down the edge, then put the walls together again, and secured them with the screws. Its nice to have a beer when you've gotten that far. After I got the walls together, I put it on top of the base, taped it down, drilled 8 holes (2 for each wall) through the base to the walls. And screwed it together. This is a BAD example of the top seal. It looks like frosting. You DON'T want it to look like frosting and its something I've mostly fixed since I took this pick. You want it to be a very even stream of silicone around the top. If it has waves, it makes it harder to keep the sound out because there's more of a chance that  there will be a hole in the seal, and that's what you're trying to avoid. Remember, the smoother, the better. Here's the box with the closed-cell foam in the boxes. You can also seethe latches on each box and the synchronization setup. Here is my synchronization  setup. Basically at the beginning of each setting I flip the switch for a second. This will show up in the audacity file because there will be three one second loud bursts on each track. Here's the recorders in the box. One in the copper shielding, one out of the copper shielding. The inner box/foam provides a portion of the sound isolation. The outer box/foam provides another portion of  sound isolation.