Question about DIY bass traps !

[dangersgs]

So tomorrow I'm making my bass traps with rockwool.I normally wouldn't have wanted to put bass traps in my room if wasn't for my huge problem with bass.I can't hear the bass in the center of the room at all but if I go in the corners I can.I think it's called "standing waves"". So basically I can only put one bass trap in every corner and it would be 3 feet/1 meter tall from the ground. I can't hang bass traps on walls under no circumstance.If I was living alone it would be a another thing but in my current situation I can't.Are these 4 bass traps enough to solve my standing waves problem or am I just wasting time ?

Also is this exact type of rockwool safe for your health in long term exposure ?
http://www.mprofil.ru/upload/catalog...c1836790a0.jpg
I posted this picture because the packaging looks just like THE ONLY ROCKWOOL I could find in my city.
Thanks !

[bandcoach]

Rockwool is fine as long as you don't touch it and you ensure that it is safely enclosed (you shouldn't get any stray fibres floating in the air, but it is always best to have a cover it anyway.

However, you seem to have decided on a solution without understanding your problem......

What frequencies are being generated in your room?
Will a single bass trap design be the best solution to the problem?
Do you need to provide coverage over a range of frequencies?
What are the standing wave frequencies?
What other treatment might you need?

Answers to these questions can only be found by using the rooms dimensions, construction materials and other factors described here to decide on what your course of action should be........

[dangersgs]

Rockwool is fine as long as you don't touch it and you ensure that it is safely enclosed (you shouldn't get any stray fibres floating in the air, but it is always best to have a cover it anyway.

However, you seem to have decided on a solution without understanding your problem......

What frequencies are being generated in your room?
Will a single bass trap design be the best solution to the problem?
Do you need to provide coverage over a range of frequencies?
What are the standing wave frequencies?
What other treatment might you need?

Answers to these questions can only be found by using the rooms dimensions, construction materials and other factors described here to decide on what your course of action should be........

Thank you for your answer ! I've decided on this solution only because I know I can't do anything more in my current living situation.I would have done more research but those 4 basstraps in the corners are the most I can do.And from what little research I did it seems that everybody recommends basstraps in the corners for problems with low frequencies. What I'm trying to say is either these bass traps help or I'm screwed.It's either this or nothing.

[bandcoach]

Thank you for your answer ! I've decided on this solution only because I know I can't do anything more in my current living situation.I would have done more research but those 4 basstraps in the corners are the most I can do.And from what little research I did it seems that everybody recommends basstraps in the corners for problems with low frequencies. What I'm trying to say is either these bass traps help or I'm screwed.It's either this or nothing.

Actually, no, your solution is to know what design to use to make bass traps that will address your problem ... I would point out that you did not at any point identify which bass trap design or technique you were using, nor have you given room dimensions - from those two pieces of information I can advise you whether what you are proposing to do will work or not, anything else would spitting into the wind.....

[dangersgs]

Actually, no, your solution is to know what design to use to make bass traps that will address your problem ... I would point out that you did not at any point identify which bass trap design or technique you were using, nor have you given room dimensions - from those two pieces of information I can advise you whether what you are proposing to do will work or not, anything else would spitting into the wind.....

I hope I'm not crossing the line asking you this especially after you provided that link for me.But could you advise me based on a drawing of my room ? As far as bass trap design goes I'm just gonna use a 5 inch thick rockwool panel with a wood frame and covered with a fabric and put one in every corner.If you recommend something else please let me know.
Here is a drawing of my room.I plan to put my desk where the sofa is if necessary.You can find the room dimensions in the image also.
http://i45.tinypic.com/bgs8pt.jpg

[bandcoach]

height of the room???

[dangersgs]

height of the room???

2 .40 meters / 7.8 feet

[bandcoach]

Ok, so based on those dimensions, your room modes (standing waves at full wave length/half-wave/etc) are:

Mode	H	Pitch	Diff	W	Pitch	Diff	L	Pitch	Diff
1	72.44 Hz	D	-0.98 Hz	43.46 Hz	F	-1.96 Hz	26.9 Hz	A	-0.6 Hz
2	144.87 Hz	D	-1.96 Hz	86.92 Hz	F	-0.39 Hz	53.81 Hz	A	-1.19 Hz
3	217.31 Hz	A	-2.69 Hz	130.38 Hz	C	-0.43 Hz	80.71 Hz	E	-1.7 Hz
4	289.74 Hz	D	-3.92 Hz	173.85 Hz	F	-0.76 Hz	107.62 Hz	A	-2.38 Hz
5	362.18 Hz	F#	-7.81 Hz	217.31 Hz	A	-2.69 Hz	134.52 Hz	C#	-4.07 Hz
6	434.62 Hz	A	-5.38 Hz	260.77 Hz	C	-0.86 Hz	161.43 Hz	E	-3.38 Hz
7	507.05 Hz	C	-16.20 Hz	304.23 Hz	Eb	-6.90 Hz	188.33 Hz	G	-7.67 Hz
8	579.49 Hz	D	-7.84 Hz	347.69 Hz	F	-1.54 Hz	215.24 Hz	A	-4.76 Hz
9	651.92 Hz	E	-7.34 Hz	391.15 Hz	G	-0.85 Hz	242.14 Hz	B	-4.80 Hz
10	724.36 Hz	F#	-15.63 Hz	434.62 Hz	A	-5.38 Hz	269.05 Hz	C#	-8.13 Hz

What we get from this is that the freqs around 217 Hz and 434 Hz are going to be problematic as they are reinforced in 2 dimensions in your room.

in addition there are several pitch areas that need taming in the low end, so you will need to be designing a broadband bass trap similar to thsoe shown at Recording Drums

Also consider the design found here Steven P. Helm: DIY Bass Traps and here Steven P. Helm: DIY Bass Traps

[dangersgs]

Ok, so based on those dimensions, your room modes (standing waves at full wave length/half-wave/etc) are:

Mode	H	Pitch	Diff	W	Pitch	Diff	L	Pitch	Diff
1	72.44 Hz	D	-0.98 Hz	43.46 Hz	F	-1.96 Hz	26.9 Hz	A	-0.6 Hz
2	144.87 Hz	D	-1.96 Hz	86.92 Hz	F	-0.39 Hz	53.81 Hz	A	-1.19 Hz
3	217.31 Hz	A	-2.69 Hz	130.38 Hz	C	-0.43 Hz	80.71 Hz	E	-1.7 Hz
4	289.74 Hz	D	-3.92 Hz	173.85 Hz	F	-0.76 Hz	107.62 Hz	A	-2.38 Hz
5	362.18 Hz	F#	-7.81 Hz	217.31 Hz	A	-2.69 Hz	134.52 Hz	C#	-4.07 Hz
6	434.62 Hz	A	-5.38 Hz	260.77 Hz	C	-0.86 Hz	161.43 Hz	E	-3.38 Hz
7	507.05 Hz	C	-16.20 Hz	304.23 Hz	Eb	-6.90 Hz	188.33 Hz	G	-7.67 Hz
8	579.49 Hz	D	-7.84 Hz	347.69 Hz	F	-1.54 Hz	215.24 Hz	A	-4.76 Hz
9	651.92 Hz	E	-7.34 Hz	391.15 Hz	G	-0.85 Hz	242.14 Hz	B	-4.80 Hz
10	724.36 Hz	F#	-15.63 Hz	434.62 Hz	A	-5.38 Hz	269.05 Hz	C#	-8.13 Hz

What we get from this is that the freqs around 217 Hz and 434 Hz are going to be problematic as they are reinforced in 2 dimensions in your room.

in addition there are several pitch areas that need taming in the low end, so you will need to be designing a broadband bass trap similar to thsoe shown at Recording Drums

Also consider the design found here Steven P. Helm: DIY Bass Traps and here Steven P. Helm: DIY Bass Traps

Thank you !!!! Does using those metal frames instead of wood make any difference ? And where should I put the bass traps ?
I made 4 basstraps with wood frames and placed one in each corner.I moved my monitors on the shorter sided wall from the right and now the bass seems to be focused in the center of the room.But I still can't hear it from my desk.I have to move 2-3 feet back to hear it.

[moses]

So tomorrow I'm making my bass traps with rockwool.I normally wouldn't have wanted to put bass traps in my room if wasn't for my huge problem with bass.I can't hear the bass in the center of the room at all but if I go in the corners I can.I think it's called "standing waves"". So basically I can only put one bass trap in every corner and it would be 3 feet/1 meter tall from the ground. I can't hang bass traps on walls under no circumstance.If I was living alone it would be a another thing but in my current situation I can't.Are these 4 bass traps enough to solve my standing waves problem or am I just wasting time ?

Also is this exact type of rockwool safe for your health in long term exposure ?
http://www.mprofil.ru/upload/catalog...c1836790a0.jpg
I posted this picture because the packaging looks just like THE ONLY ROCKWOOL I could find in my city.
Thanks !

Before going into the details, I would urgently recommend you to check your loudspeaker wiring!! Your problem sounds like a simple phase issue (i.e. the polarity). A big hole in the low end exactly between your speakers is a clear for wiring issues.

Red to red, white to white (I'm not a racist, just talking about cables ).

(Still, add bass traps, the more the better. But your problem doesn't sound like a typical room acoustics problem)