Quick preface: I have a small room, about 2000'3, that is lively in mid to upper frequencies. I have not tested yet with REW, but my Umik1 will arrive later this week. (Along with my long awaited towers.) My endgame for this room is approaching, and pending the testing I will do, I am considering building some panels to help attenuate that liveliness.
I'm in the camp of only treating the room after all else is in place. This is not something I am considering lightly, rather if I do it... I want to make certain its done right!
That said:
I am considering 2-4 panels. 1 pair at the first reflection points. Possibly 1 pair behind the speakers.
I've seen a lot of information about building them... easy enough, but a couple questions remain.
Considering I am looking most likely at frequencies, say 1500Hz and up, is there a correlation between the thickness of the panel and the frequencies they work on? (I know if I was trying to absorb LF, I would need 4".)
I've seen many mentions of space behind the panel, between insulation and wall. I have not seen any designs for this.
What is the benefit/how does it work?
How much space to insulation thickness?
I've also seen it mentioned about using slotted panels or pegboard in front of or behind the insulation as part of trapping certain frequencies... but this seems to be rare info that I could not corroborate... does anybody have any insight about this, please?
Thanks in advance!