I would make all the panels with 2 sheets of insulation (eg 6" thick total).
You should able to take a measurement with REW, then set the graph to 1/3 octave smoothing - that should give you a general idea of the room at that listening position.
Also, write down all the settings, where you set the mic, the gain, level, etc. So when you do your "after" you have the exact same settings.
When you run the test set your DAW to record also, this will give you a visual waveform to look at which can be more helpful than the graph in REW IMO.
See ideally every tone coming out of that test should be recorded at the exact same volume. So you would have a perfectly flat wave form (and a flat graph in REW).
The peaks and dips show the problem frequencies, which hopefully your traps will compensate for.
That foam on the wall and the blankets do nothing.
Use Auralex panels, or make your own with some ultratouch insulation and cloth. Don't hang it directly on the wall. Hang it some distance off the wall, such as 16", to maximize the sound absorption. Auralex provides a free room analysis, showing which Auralex products to use and where to place them. You can then substitute home made (DIY) products with similar or better sound characteristics. The DIY products are also cheaper.
Hang it some distance off the wall, such as 16", to maximize the sound absorption.
I assume you are talking about straddling a corner?
Those panel tests actually hang the panels 16" from the wall. Seems like a waste of space for not that much more benefit.
Well, the smaller the trap, the lower the performance. An inch or so is not that big of deal I suppose compared to nothing. Curious, why the window frame matters? Are you planning straddling the corner, or doing 'superchunks'?
BTW, Purple is the new manly cool!
Well, never enough bass traps. Too many broadband traps in a small room can effectively make the room lifeless. The main problem is with standing waves in a small square room with even dimensions. Working at stopping the peaks and nulls with corner traps seems to be the best 'first' task. Adjust the need of further bb panels by what the room sounds like after getting the low end under control.
Man, I was looking forward to seeing purple traps!
Naw man, you on the right track. Actually, an air-gap between a bass trap and wall, is beneficial. No worries there.
Have you tried just doing the sine-wave that arcadeko recommended, and listening to the volume of frequencies that need help? You should be able to hear frequencies that get louder or softer than others. Treatments will even these out. Just your ear can work to a degree, as long as drums and crystal meth haven't fried your ears yet. lol! About the meth thing. Not funny really, my step son is in jail for that shit again. Worst drug ever. Anyway, keep your nose clean dood. Music is the best drug.
Did I just do a big brother/dad thing there? Sorry, I'm pissed at my kid.