Feb 27, 2006 08:58 am Hey there parallax, welcome to HRC.
I'd say that high end freq would mostly be cut with whatever you use, so that's probably not the most of your problem. The Bass will go through the walls, and into your neighbors futon, so that's what you want to target.
To target (and stop/absorb) low end, you need either 1. mass, or 2. air space. Since airspace will be abundant outside of your box, I'd say to focus on the mass part.
Drywall is a good mass, and I believe mdf or particle board is fairly decent. Seeing as how you're going to be moving this contraption by hand, weight will have to be a factor as well.
Now the fun of back and forth importance : effectiveness vs. weight.
A 6x6 panel of drywall + mdf will be pretty heavy and hard to handle. I'm thinking you can figure out the total weight of different materials. Do the math before you start purchasing. Basically, the thicker, or more mass, the better.
Another concern; a small box will have very bad sound reflections inside. Even with lots of absorbsion material, the sound probably won't be what you like. I'd advise doing a few expirements first, before you start buying and building.
Packing blankets can tame high end slap, and rigid fiberglass can absorb some of the mid range. It'd most likely be a pretty challenging task.
