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The rock wool is very hit and miss.
How are you working out which frequencies the rock wool is acting on.
If you build a helmholtz resonator you can tune the specific frequency and broaden or tighten the "Q"....
Building a helmholz trap is like EQing the room...
putting up piles of rock wool is like using a tape machine to tame the dynamics of a bass guitar...
You could end up with a room full of rockwool .. and a really dead sound ad the rock wool will definitely diffuse mid and hi frequencies...
the rock wool idea sounds like a good Idea but in practice its like a fire blanket....
A helmholtz resonator is relatively cheap to construct....
I can design one for you if you like???
The formulas are good for working out the problem frequencies but a frequency response test of the room from your listening position is the best way to find the troubling frequencies...
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