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I'm slowly going in the other direction. I have no practical experience with
this (yet) but a plan that I find attractive is to first determine the problem
low frequency modes by measurement then hit them with resonator traps
tuned to those frequencies. Keep adding resonator traps until the bass is
acceptable (if it's possible). Then listen to and measure the room to see
what's up and decide what remains to be done.
The problem I have with the "add the standard absorption first" plan is that
it is broadband and will absorb a lot of energy that might not need absorbing.
But you'll never know that you lost useful energy.
For example, I see one alternative to absorption in a spot for an early
reflection (if you don't want that reflection that is) is to use a reflective
panel positioned at an angle so it sends the sound elsewhere. Why throw
all that energy away ?
Paul P
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