Low frequences problem, need help!

Hi John I am really stuck with this problem.

can you post your .skp file.

Of course, gladly. Thanks John. In the properties of the objects(component) is written which is witch. WINDOW/COMPONENT OPTIONS-click on the component to see its name.

this is what I'd suggest to treat your long narrow room.

OUCH this is painfull!! :( John you suggest to start from the begining?!! So in your opinion the situacion in my room is helpless as it is now(not posible to continue with tretman)? Thanks John.

I'm just showing how I would approach the problem - I'm suggesting the amount of treatment I believe you need - you already have some of it in your units i.e. the resonator parts - the addition is more high end wall treatment and hanger traps for broadband low end absorption plus getting some angles into the ceiling.

Thanks John.What do you think to make hangers instead of corners Helm holtz. In that case I could get some bigger angels and more broadbend abrsorbtion on the low end frequnces?After all my biggest problem is 20-130hz. Without beck corner HelmHoltz resonators I will have big hole on 30hz.

have them both Duki

Hi John. Could this be the solution? Ps- I do not understand very good how the hangers work(every hanger board resonate on some frequnce depend on its size and the rockwool absorb the vibration)??? If this is solution could you help me with hangers(dimension of the core boards,specific weight,the thickness of the core board in the midle, isolation over core etc... ?? In the sketchup file blow is what I think is wright dimensin for hangers,plase give me your coment on them. : :oops: I am afraid when i remove front and back GOBO(replaced by hangers) to lose mid-high absortion??

Hi John what do you think about solution above?

Yeah - I'd give that a go but I'd keep the two red units and put them on the side walls.

Ok John before i start with hangers can you give me your opinion about this on the back and front wall, in that way i can keep the red unit in the midle. http://www.trikustik.at/fileadmin/media ... n_R8D3.pdf I would use the green line(20cm thick with 18cm of rockwool)? The units could be 70cm x 265cm hight ,four of them. On the beck side wall i plan to produce more wide range absorbtion from 125-2000hz(but after i solve the problem below 125hz) Thank John.

I forget to ask if it is not too much trable for you to compare(roughly) hangers absorption coefficient with those graficon above(i mean the amount of hangers assumed in my case)? In that way we can learn something. If i am asking too much plase skip this question and please do not take this wrong.

Duki - the hangers will take care of the region your panel resonator covers anyway.

Thanks John. About the hangers. The midle part-core- can i use 6mm mdf(4.32 kg/m2)? The isolation rockwool 5cm thick 50kg/m3(is this ok)? How many cm should be between hangers?

Yeah - officially the centre core should be soft fibreboard. looks like this - it's commonly used as notice board material as you can stick drawing pins into it - it's 12mm thick.

Ok John this looks like layers of paper,cardboard. I allready saw this picture on this forum and i tryed to find something similar but no success(because of that i am runing away from hangers). Please can you suggest somthing else for the core?

Ok i finded someting on the net but as i understand there is no substitute for homosote. "No other fiberboard is manufactured like Homasote, nor does any other board match its physical properties. The result is a weather-resistant, structural, insulating, extremely durable board with two to three times the strength of typical light-density wood fiberboards" http://www.housing.com/categories/homosote.html

then just use a thin plywood, chipboard or mdf.

Hi John Maybe i found something like homosote from cardboard factory, they also produced this bard from recycled paper. Is the number of hangers on my drawing enough?

mount them approx 200mm apart.

John you mean the distance between core 200mm or between isolation(rockwool)? Thanks.

Hi John The problem was in the amplifaier so I will not change enithing.Now I have very good bass control. Thank you for all,I have learned a lot. Best regards Duki

great news Duki - you really had me baffled :)

After awhile greatings to all. :D I have a question,I was reading about diffusors and I have idea to make one.According to the drawings what are yours opinions? I know that John do not like diffusion( :?: ) in the control room . PS my english is not so good :oops: