diy slat absorbtion design question

hello all, have a question about the slat wall design calculator in relation to room mode issues correct me if i am wrong 1. if i am reading this right the dimensions typed into for example mode calc from real traps tells me what issues i will run into. there is a graph option that has a black, red, and blue bar. the directions tell me that if there is a close concentration of these bars that this is were i am going to run into issues? my room is 9.4x9.2x7.3 imperial and of course square. i floated it on a concrete slab off of bar matting and two layers of 3/4 OSB then MDF siliconed to the top, then of course pergo. The walls are 5/8 and 1/2 sheetrock on each side woth the inside wall of the room a layer of sheetblock or mass loaded vinyl between. the cieling is hanging on resilient channels and all final layers are siliconed with xst paintable silicone 100%. so at this point the room is very sound proof but sounds like ass of course. So now I need to add the slat walls and bass traps yada yada and I want to do it right!!! had no other option to angle walls due to lack of space and of course did not run into this site until the sheetrock was done. so reading this correctly tells me i have issues in the 60hz, 300hz, and 500hz ranges? 2. So now given these ranges I used the slat calculator but this is the big question. do i build specific separate slat partitions to address these ranges? example; the 280hz-300hz is a .25 imperial gap between slats using .75 thick wood. do I use the same thickness for the entire length of the wall 2 foot wide then use another thickness for the other proplem frequency and so on or should I combine a lalapalooza of all the slat gaps into one so I cover all the problem frequencies? what ever I do slat gap wise I will be doing 4-6 inches deep by 3 wide by 7 high in 3 sections angled using 3 inch maple slats. I just want to know the best way to do it so that I do not waste time, energy and of course money. I have a few left over cases of killer maple that is pre-finished maple boards .75 x 3'' that is just aching to be used for this. ohhh and just to let you know the issue with my room is of course a hollow boxy sound. I would like to keep it live sounding for acoustic and vocals only. Any help on this would be killer and I will of course participate in photo's of the whole project for this weekend to share for everyone out here. let me know if there is anything i missed or you need pics ect. :D

ok so i went out and got some nice looking 8 foot long 6 inch wide 3/4 pine boards for the project. i have decided to make slats relative to all of the mode issues so 4 different gaps all alternating on the same unit. if anyone has anything to add please do cause i am just gonna do one this way. :wink: looks like everyone on the other side of the world is asleep. ps. if this is a newbie post about this issue then please just get me to the right erea. i do not want to be redundant my power supply on my rig does though! thanks in advance :wink:

Aloha and welcome to the forum! :D Congrats on your studio build! Any chance you could please:

Edit your profile to include your location. This is very important, because this is a worldwide resource, and as such, material costs and availability vary widely. For example, masonry is cheaper than gypsum in some parts of the globe, whereas it's the exact opposite in other regions.

You'll probably get more of a response by doing so and this will really come in handy two or three posts down the road. It's also part of the forum guidelines. Thanks! :wink: For more info, check out both of these links - http://www.johnlsayers.com/phpBB2/viewtopic.php?t=7572 http://www.johnlsayers.com/phpBB2/viewtopic.php?t=3231 Looking forward to your build! Aloha 8)

thanks, this has been a killer resource for me. Ok so i stayed up late last night and cut out these dimensions. my room is 7.4 high so i made the first frame for the slat wall 41 or so inches high pretty much half of the height of the room minus the base boards that are at the floor. I cut 13 maple boards with 10 degree angles on the edges at 22.5 long and 3 inches high. my side boards for depth are as follows; left: 4.5 inches right: 6.0 inches i then cut my top pieces for the frame at angles between these dimensions so that the slats had a recess of 1/4 inch or so on the face for good looks. here is the data I got by using the slot calc after assembling the unit. wall depth at angle 6 5 4.5 inches --------------------- slats numbered from top to bottom gap in millimeters coresponding to slot calc at above depths and corresponding Hz results from calculator 1. 4 4 4mm ------------------------ 221hz 231hz 241hz 2. 8 8 8mm ------------------------- 291hz 318hz 333hz 3. 9 9 9mm -------------------------- 307 336 351hz 4. 8 8 8mm --------------------------- 291 318 333hz 5. 7 7 7mm ---------------------------- 274 300 313hz 6. 15 15 15mm ---------------------------- 383 420 437hz 7. 4 4 4mm ----------------------------- 211 231 241hz 8. 7 7 7mm ----------------------------- 274 300 313hz 9. 17 17 17mm ----------------------------- 403 442 461hz 10. 8 8 8mm ----------------------------- 291 319 333hz 11. 13 13 13mm ------------------------------ 361 395 412hz 12. 5 5 5mm ------------------------------ 235 257 268hz 13. 9 9 9mm ------------------------------ 307 336 351hz :D so you can see that an angled slat design varies depth across the width and thus giving you a range of obsorbtion in the frequencies. i went ahead and guessed at the gaps bettwen trying to stick with 4-20mm gaps. I will post pics of the unit soon. I hope this data helps any of you!! My next slat design will use 2 inch slats Vs. three and have a depth of 4 inches. i am trying to address 125hz to 275hz in the next design. this design was 211-461hz as you can see it is much like a rubiks cube, you change one thing in the slat calc and then it changes everything else so factor in your wood depths and the space you need in your room. my room seems to be getting smaller but who needs a 10x10 room that sounds like ass. I found this design to be easy and fun as well as very astheticaly pleasing and practicle. thanks so much guys for making this easy to find data and resouces. :D :D

Hey BustinJustin Your project sounds cool. I'm in the process of framing a studio project right now and want to plan for some slat chamber configurations as you have been building. Did you snap any photos along the way? This would be helpful Thanks :D Larry D