Quote:
Originally Posted by
chrismeraz
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You need to cover 100% of the rear wall with broadband absorption in order to get kinda halfway to a netrual sounding room; treating just the corners won't do a thing. Later on you could do the side walls and ceiling. It's all prohibitively expensive unless you learn to make your own.
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Ehhhh.... don't know if i agree with the part quoted in bold.
First of all depending on how far your back wall is from the listening position, broadband absorption may not be necessary and if far enough can be treated in better ways to minimize over absorption between 1khz-8khz.
Now the caveat is if your backwall is close to the listening position (if you setup your monitoring on the length walls instead of the width), then yes broadband absorption will be needed, but this is not usually the case.
Secondly, the modes terminate in the corners. Also from corner to opposite corner its the longest dimension in your space. So yes treating the corners in some way is necessary and because you can hit 3 modes at the top and bottom of the corners (where 3 walls meet) its beneficial/bang for your buck as well.
But treating the entire surface may be necessary as well, especially if you are dealing with SBIR/non resonant reflections. Also when dealing with drywall structures, the strongest reflections are between joints (wall to wall, wall to ceiling, wall to floor) which are the densest structures (they have to be to hold up the walls) and can be somewhat calculated (for the drywall itself, because it flexes, the level and phase of the reflections are more difficult to predict which is why the SBIR calculators are usually wrong).
So around the monitors (front wall, side walls, ceiling and floor) when treating for SBIR (that's affecting the frequency response), treating the corners correctly actually makes a difference. But if you treat the entire surface, obviously the corners will be treated as well.
By the way, if your walls are made of dense materials, then the treatment approach changes, based on the criteria you choose.
The point to all this "stuff" is that you have to have a treatment plan that you are shooting for and not just do things randomly based on your specific space.