Will these panels absorb lower frequencies?

[yepimonfire]

looking to prevent standing wave problems especially on the ceilings and back walls, if i go near them i get extremely exaggerated bass, cannot stand up or go towards back wall or it sounds horrible.

 

[mike c]

yes they will.

 

[yepimonfire]

will placing them on the back wall and ceiling be sufficient enough to stop the problem? im not looking for an acoustically perfect room, i just want to be able to stand up without having 3x the bass.

 

[zhimbo]

Are you sure you want to go with those panels? What about these panels instead?

 

[highfigh]

will placing them on the back wall and ceiling be sufficient enough to stop the problem? im not looking for an acoustically perfect room, i just want to be able to stand up without having 3x the bass.

You need to be a little more specific. Thin panels, no. Thick panels, definitely and my room is proof.

 

[yepimonfire]

i just want to have equal bass standing and sitting, is this a common issue?

 

[yepimonfire]

is it normal to have the standing level bass issue or am i a rare unlucky person?

oh wow im an idiot, i just noticed i never posted the link to the panels and i even missed the "jokes" people made about it, oooops

http://www.atsacoustics.com/item--ATS-Acoustic-Panel-24x24x4--1007.html

 

[yepimonfire]

this looks interesting, what about installing these at the wall/ceiling level?

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=260302361711&fromMakeTrack=true&ssPageName=VIP:watchlink:top:en#ht_1291wt_859

 

[highfigh]

i just want to have equal bass standing and sitting, is this a common issue?

It's a common problem and most people aren't willing to deal with it because bass absorbers tend to be large. I put 4" thick panels behind my speakers, with the left one butted up to the side wall. The right one butts up to the short projection where I removed the original right side wall. I also have a 1' x 42" panel at mid-height in the far right front corner and a 2" thick 2'x4' panel at a slight angle in the left rear corner, with two 2" thick 1'x 42" panels above that. The difference in bass response is drastic- smoother and better distribution with no real hot spots. It was bad across the front wall and especially in the right front corner. I never went into the left front corner but I would have to assume it was the same- bad. I also measured a big dip in the bass region and that's all but gone now.

 

[yepimonfire]

thanks for the info, any idea on those "wedges" or if these will work http://cgi.ebay.com/Auralex-4-CornerFills-Acoustic-Foam-Studio-Panels-9pk-/350332358573?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item51916f8fad if so, where would you suggest i place them, i dont have issues in the corner, just at standing level, there really isnt any hotspots as far as if i walk around the room the bass sounds almost identical, but when standing i get a 2x increase in bass, i just want to get rid of that.

honestly i cant think of how this issue is logical or what it is stemming from considering the sub is on the floor. how is the bass getting to the ceiling is my question.

 

[yepimonfire]

alright ive figured out what i want, corner bass traps, my last remaining question is would it be logical to conclude that since i have exagerated bass when i stand rather then sit, that the bass is building up where the ceiling and wall meet meaning that would be the best place to put them?

 

[just-some-guy]

idk, but i don't see that ebay foam doing much. unless you had about $2000 worth of it.
also notice, it says $10 shipping. and down at the bottom it says
"Free shipping on every Auralex product "
sheeesh

afa your issue. i wonder if your couch is eating up some bass.
and i bet its your ceiling/wall interface that is boosting the bass.
so yes, that would be a good place to start.

do you have pics of the room ?

 

[highfigh]

thanks for the info, any idea on those "wedges" or if these will work http://cgi.ebay.com/Auralex-4-CornerFills-Acoustic-Foam-Studio-Panels-9pk-/350332358573?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item51916f8fad if so, where would you suggest i place them, i dont have issues in the corner, just at standing level, there really isnt any hotspots as far as if i walk around the room the bass sounds almost identical, but when standing i get a 2x increase in bass, i just want to get rid of that.

honestly i cant think of how this issue is logical or what it is stemming from considering the sub is on the floor. how is the bass getting to the ceiling is my question.

The thing about standing waves that's hard to grasp is that where you notice them is caused by the room's dimensions and it's necessary to visualize a sine wave on a graph when considering those dimensions. When you're sitting, your head is in a position that would be close to the 0° (or 180° ) point on the center line (low energy). When you stand up, it's now at, or near, the 90° or 270° point. If you create a sine wave, you can determine where these points are by marking 90° at one wall and the distance to the other wall at 450° (the walls/boundaries are where the velocity is lowest but the energy is highest). Divide the dimension by four to determine the 0°, 180° and 270° and 360° points. These will tell you where the high and low energy areas are.

The louder bass you hear when you stand up is caused by the standing wave corresponding to the height of the room. You would need to put bass traps in the corner of the walls and ceiling of the front and back walls to minimize this. Then, you'll need to move across the back wall to determine where the standing waves across the room coincide- these will be minimized by placing the bass traps in the vertical corners and possibly in mid-span.

Go around the room and, making a soft fist, using the soft part of your hand, pound on the walls at various points along their length. You'll probably hear some places that produce a definite note and these are being excited by the sound, then radiating that frequency. Other frequencies will cause resonances too, but it'll be strongest at those notes, or a multiple.

 

[yepimonfire]

this was my thinking was to place a trap at the top of each room corner, and then one where the wall and ceiling join on each wall, would placing a trap closer to the sound source help or should it be mid-room? here is my general idea red block is the sub, no moving it away from the wall does not help it only makes it worse, the gray things are bass traps, they are triangle shaped the closer i move towards the sub the worse the issue gets, moving farther from it slowly and slightly slopes the problem off, but not enough to make a difference, seems to be bad all over no matter where i am standing, the gaps in the black rectangle are openings that do not shut and therefore do not require traps along them. the traps are 12" long.

of course i can just screw around with the placement of the traps until i figure out where they work best, ive spent a few hours attempting to track the issue down, the wall and ceiling conjuction is a source but more so the wall and ceiling conjuction at the corners is acting like a giant pyramid shaped bass horn. im just looking for a good starting place.

 

[yepimonfire]

actually they are 24" long oops and the ones on the wall behind the sub will not be pressed hard against the wall due to window frames so they will be sticking out about 4" into the windown fram, but they will be tight in the actual corner.

EDIT: nevermind, i was paying attention to where the windows are at and there is no way i can put bass traps in the corner they are in, which would be ever corner but the bottom left, i will just place them along the ceiling wall conjuctions.

 

[highfigh]

View attachment 8358this was my thinking was to place a trap at the top of each room corner, and then one where the wall and ceiling join on each wall, would placing a trap closer to the sound source help or should it be mid-room? here is my general idea red block is the sub, no moving it away from the wall does not help it only makes it worse, the gray things are bass traps, they are triangle shaped the closer i move towards the sub the worse the issue gets, moving farther from it slowly and slightly slopes the problem off, but not enough to make a difference, seems to be bad all over no matter where i am standing, the gaps in the black rectangle are openings that do not shut and therefore do not require traps along them. the traps are 12" long.

of course i can just screw around with the placement of the traps until i figure out where they work best, ive spent a few hours attempting to track the issue down, the wall and ceiling conjuction is a source but more so the wall and ceiling conjuction at the corners is acting like a giant pyramid shaped bass horn. im just looking for a good starting place.

Look at the percentage of how much corner is treated and how much is untreated- treatment in any amount will only do so much, so more treatment will do a better job. Try treating the whole conjunction (usually called a 'cornice') and see how much difference that makes. Then, try half of the rear and half of the front. That may be better than one piece on each wall.

Have you gone to the Auralex site? They have a way to determine how much treatment is needed.

 

[yepimonfire]

yes i know that but all it told me is that i need to buy this 700 dollar package but i dont intend on reducing mid-high frequenices, just bass so thats really no good im thinking about putting 24x4x4" corner fills in all the corners and then just treating the wall/ceiling conjuction where theres no windows with the traps. or possibly just going 100% on corner fills at corners and conjuctions. and treating as much as possible with them.

http://cgi.ebay.com/Auralex-4-CornerFills-Acoustic-Foam-Studio-Panels-9pk-/350332358573?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item51916f8fad i can afford enough of these to treat every 90 degree angle in the room.

 

[highfigh]

yes i know that but all it told me is that i need to buy this 700 dollar package but i dont intend on reducing mid-high frequenices, just bass so thats really no good im thinking about putting 24x4x4" corner fills in all the corners and then just treating the wall/ceiling conjuction where theres no windows with the traps. or possibly just going 100% on corner fills at corners and conjuctions. and treating as much as possible with them.

http://cgi.ebay.com/Auralex-4-CornerFills-Acoustic-Foam-Studio-Panels-9pk-/350332358573?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item51916f8fad i can afford enough of these to treat every 90 degree angle in the room.

By "treat", do you mean the whole height of the corner, or one piece per corner? If you mean one per corner, you can cover more of the room if you have the ability to use a razor knife, stapler, scissors and a tape measure/straightedge. I bought a 24 pc bundle of 1" Owens Corning 703, some 2'x4' pieces of pegboard (just to save time), spray-on contact cement and 10 yards of muslin for about what 4 of those 4"x4"x 2' pieces cost- for a few bucks/yard more, you can get material that's similar to what's in the ebay auction. I glued two or more pieces together to add thickness, glued them to the pegboard and covered them with the muslin to keep the fibers from shedding.

IMO, 4" x4" won't do a tremendous amount to kill the bass problem.

 

[yepimonfire]

alright would just placing the traps at the ceiling wall conjuction be sufficient? i dont have the time or know how for DIY stuff, especially in the bass department where you need alot of absorption

 

[highfigh]

alright would just placing the traps at the ceiling wall conjuction be sufficient? i dont have the time or know how for DIY stuff, especially in the bass department where you need alot of absorption

In theory, it should work.

A lot of how well it works depends on how the place was built. I had a thread about a theater I was working on and it had a huge peak at about 90 Hz. I assumed it was built according to what I told the homeowner and it turns out that his guys cut some corners. I had him insulate the wall and double the drywall- it smoothed everything out nicely. Without seeing, touching and hearing your room, I can't say if it will do what you want.