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I do not know your situation, but if you are determined to completely self-build, which we did half of, then we did find the FKR/FSK foil-fronted stiff 705/814 type panels to be more effective on fewer corners than any thinner or less dense material, as Ethan clearly shows. Of course, face only a single panel of the foil out, and rip off the other, since the trapping occurs much behind the panels. It seems to come down, in many ways, to how much space you are willing to sacrifice to segregate off for sonic energy control. At some point, you incur too far into your room, without more superior designs, like the RealTraps.
At many places in the room, you may be better off considering the pre-designed soultions. They may seem expensive at first, but they actually function beyond what several pieces of plain covered stiff rockwool could do. The net savings ends up being better, and the time saved in grief and labour is way more than you might think.
For now, we did finally tame our room with personal effort. But the net cost ended up being more than it would have been to go to the existing professionals such as RealTraps, GIK, and ReadyAcoustics. We did, in fact, package many of our corners in the Ready Acoustics pre-made fabrics, which are excellent. Our home-made Gobos use a felt-type fabric that was cheaper, but is not as effective per measurement.
We are slowly moving into extended rooms of our space, and plan already to seek the aid of those providers, rather then spend our time (figure your own hourly rate, ours is rather high) on self-manufacture. Likewise, if your efforts do not seem to be working, you have someone to turn to, if you spend the extra money to obtain professional products. If you solely rely on your own work, you can only look in the mirror and feel hmm....bummed out.
Cheers.
KT
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