2" rockwool in broadband angled resonator

I'm in the midst of my studio build, i finished building some angled broadband slat resonators for the sidewalls of mix area.I was about to put the fabric and slats on , but then i realised something: i used 2" rockwool in stead of the 4" i also have. I assume it would affect mainly LF absorption negatively, but is it something i should adress before i finish them up? is it affecting the "broadbandness" too bad or is the 2" rockwool acceptable? thanks, Jaye

jaye wrote:

I'm in the midst of my studio build, i finished building some angled broadband slat resonators for the sidewalls of mix area.I was about to put the fabric and slats on , but then i realised something: i used 2" rockwool in stead of the 4" i also have. I assume it would affect mainly LF absorption negatively, but is it something i should adress before i finish them up? is it affecting the "broadbandness" too bad or is the 2" rockwool acceptable?

For sidewall units 2" should be enough (John's units use 2"). If your construction allows it, you can alway double up the 2" with another layer of 2" rockwool if you want to.

ok, nice i was hoping it would work that way, i thought John used the 4" for his. i searched the forum for it but couldn't find anything conclusive. the way i build it doesn' really accomodate for another layer especially on the end where the slat resonator is smaller. so i'' go with 2" i can use the 16 pieces of 4" for my clouds, saves some money ;-) would it be good to angle the clouds as well when i hang them? oh and i thought something up today.. i want to put some "producer desk" behind the engineers area, could i use that desk into a bass trap? basically fill it up with a stack of rockwool?

Yes, you can angle the clouds slightly to deflect non-absorbed-non-transmitted sound towards the back of the room. Sure, you could mount some absorption to the producers desk. Most treatment work best in ear-height, but you can think of the desk treatment acoustically as the equivalent of a sofa.

ok, i want to use that it for LF trapping and something resting on the floor is earier then trying to put it up to a wall or ceiling... ;-) also since LF is not as directional would it be possible to put a basstrap in just one vertical back corner in stead of two?it breaks symmetry of the room, but because of the unidirectionality of LF waves it shouldn't be a problem.. or is my thinking wrong? i want to do this becasue of the physical layout of the room (L- shaped)

broadband porous absorption tends to work best wherever the velocity of the 1/4 wavelength to be trapped is highest or at key reflection points for higher frequencies. tricorners, vertical, horizontal corners where modes terminate are typically good locations. other mode/standing wave points also tend to be good. arbitrary placement tends to be better at dealing with higher frequencies but there are some research papers that describe good effects at lower frequencies. in the end, if you don't have a "clean" way to mount everything according to "the book" then you're restricted to doing what you can... so finding a bunch of places to add the necessary absorption will require more time and effort (and might even be better for your situation - dunno) and should result in a reasonable solution, if not, you might have to make other changes to the room, or layout of equipment and furniture, or just live with the results.

ok, thats going from ideal situation, i get that..i'm sort of limited to the corners i can use but i got 3 ceiling corners i'm gonna use for LF trapping. if after the installation of other broadband treatment theres specific frequencies that need adressing i'll see how to deal with them.. thanks.