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About 8 or 9 years ago I tried to tame a severe hump at around 100hz (if I remember correctly). After a friend helped figured out the problem, I went out and bought some commercial traps spec'd to help at around that frequency (I think I remember the brand but I am unsure so I'll keep it mum). They did not do much at all- just changed the frequency balance a little bit and I still had my hump.
So I asked a friend for help and he spec'd out a DIY solution using particle board, plastic wrap, chicken wire, fiberglass, etc. I put in about 14 hours building 4 traps. The worst part of the experience was that for the first 2 traps I cut the particle board with a cheap hand-held jigsaw I bought. That was unpleasantly difficult and so for the second pair of traps I asked a guy at Home Depot to use one of their giant machines to cut my particle board.
Thereafter my hump was gone and I sold the commercial traps at a little bit of a loss.
I am no longer in the same place, am more than a thousand miles from a Home Depot, and I've been thinking recently about tamping some resonance in my room. I think a few small rockwool panels will fix my small issues. But for anything more serious I think something like GJ's solution is the best route, even if it is not a quick fix as requested by the OP.
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