Ok i have a serious problem

[yepimonfire]

ive been trying to track down standing wave issues in my listening room and eliminate them, after hours of acoustics research, i came up with that i scientifically speaking, need almost 3 feet of freaking rigid fiberglass to absorb 50hz which is the biggest problem frequency in my room. it goes from about 40hz-60 hz but is worst at 50. anyone have some ideas? can i atleast reduce the issue if i use less then 3 feet? i cant afford to lose that much room space. not to mention i have no practical way to mount 3 feet thick panels on my wall.

 

[just-some-guy]

"if" you could put 3' of treatments. where would you put them ? pic

 

[yepimonfire]

at the back wall in my listening room, its a rather small room, but the only one free in the house, would 6 inches atleast reduce the problem?

 

[just-some-guy]

do you know where this wave is propagating ?

 

[yepimonfire]

if i understand what you mean, yes, i have done tests from 100hz to 20hz and found out a few things, one, my sub rolls off STEEPLY at 30hz and cannot even slightly handle 20hz at any volume, no audible sound which i found interesting. second, the problem frequencies are worst along the back wall, each of them have different "cancellation distances" at which the waves crash into eachother, this is usually about 3-4 feet out of the wall around 50hz which is my major problem frequency, following behind would be 40hz and 60hz, mild issue at 70 but i can live with it, negligible issues past 80. standing wave issues completly stop at 100hz, so basically im looking to treat from 60hz down. ive treated the corners, which made my room atleast bearable for the time being, but the more i get into this hobby, the more obsessed i get with perfection, im tired of the kick drums overpowering the rest of the music. if i dont sit exactly mid room, i have issues.

 

[just-some-guy]

ok, this is what i would do if i had your problem. but note, i am not an acoustic pro.

go to menards (thats where i got mine from. my HD and lowes didn't have it. but ymmv. so look around)
go in the insulation area. look for rigid fiber board, 4x8x5/8"ish.
idk the name of it. but you will know it by this = you can easily break a hunk off and break it into saw dust with your hands. also, mine had a thin black coating on one side ( i have gone back since. and what they had, had a little heavier black coating on both sides . but still ok for what you need) . about $7 each.

get 4-5 of these. and get a bunch of furing strips, 4 per panel.

now.
put 2 chairs facing the wall, to raise up the panels. on them stack a panel, then 4 strips, then a panel, then 4 strips, etc, till you use all you panels.

then do some listening/testing.

if you don't like it, just take all that back. if it does work, modify it to work/look better.

 

[yepimonfire]

interesting idea, im assuming you used this before? how well would you say it works for low frequencies? also, i could maybe modify your idea and put fiberglass between the panels which would kind of make an absorbing resonator (for lack of better words) the would resonate the frequencies directly into the fiberglass.

 

[just-some-guy]

yes, but not in that way. 3/4 of my ceiling and my corner traps are made, in part, with this stuff. while i will say that idk just how good my room sounds. i can most definitely say that it sounds TONS BETTER !!!

fiberglass would help. but would be messy for just a trail run. like i said, see if it helps first.
if it does, then modify it, and make it more permanent.

 

[yepimonfire]

yea, just putting up some corner foam traps made my room ALOT better sounding, bass used to "reverb" and "hang" it doesent do that anymore, which was probably the worst issue i had, now i just want to get rid of the peaks and dips in my room.

 

[bpape]

6-8" of something like OC703 can help some down that low certainly. No, it's not the technical optimum but it will help. The biggest thing you could probably do is play with your seating and sub positions to try to minimize the problems in that area or at a minimum, shif them up in frequency where they're easier to deal with.

Bryan

 

[yepimonfire]

they are in the most optimum place possible and wtf is OC703 and all i want to do is reduce the problem to a easier to deal with issue, im not looking to entirly stop it becaus in order to do that my bedroom would turn into a smal cube inside a chamber of fiberglass

 

[yepimonfire]

o nvm i know what it is and the seating in the room to get perfect sound is like 1.5 meters from the system, which is no fun, i want to be able to sit anywhere in my room without 20db peaks, its like someone putting a kick drum a meter from my face

 

[bpape]

Sorry. Sitting anywhere in a room and expecting the response to be the same isn't realistic. If you're sitting in a place with poor response, it's very difficult to fix. You could completel fill the room with 1 foot thick absorption and sit in a corner and you're still going to have horrible boom.

Just trying to keep it real.

Bryan

 

[yepimonfire]

no but i can atleast reduce the issue. im just trying to take the extremeness off

 

[bpape]

Treatment can help some certainly. If you're not willing to sit in a known good position that does deal with the issue, then what treatment can do for you will be more limited.

Bryan