4" Backer Frame = Good?

[hduncan]

with a 4" backer frame, the traps back would be flush with the wall but would space the trap 4" off the wall. Is it a problem that the wood is touching the wall all the way around?

[Glenn Kuras]

Originally Posted by DarkEcho

with a 4" backer frame, the traps back would be flush with the wall but would space the trap 4" off the wall. Is it a problem that the wood is touching the wall all the way around?

So your going to make a 8" frame and put 4" rigid fiberglass inside but spaced 4" from the wall? It would work that way but keep in mind that sound also comes in from the sides which pick up sound also.

Glenn

[hduncan]

Yes, that's what I am asking.. Will the solid wood prevent absorption?

Here is a drawing of what I am suggesting- it might make more sense to see it.

Which of these two would provide the best broadband absorption? Is leaving the back exposed to air significantly important to the performance?

[jdg]

the solid wood parts would reflect mids/highs. thats about it.

its best to have your frames be as "invisible" as possible, unless you are trying to make some reflections.

[hduncan]

Hmm, well I wonder what ways there are to space a trap 4" from the wall without having too much more of a frame?

[Weasel9992]

Originally Posted by DarkEcho

Hmm, well I wonder what ways there are to space a trap 4" from the wall without having too much more of a frame?

Angle iron and wall anchors. Easy as pie.

Frank

[hduncan]

Originally Posted by Weasel9992

Angle iron and wall anchors. Easy as pie.

Frank

I don't quite follow, how does angle iron work to space panels off of a wall?

[Glenn Kuras]

Originally Posted by DarkEcho

Yes, that's what I am asking.. Will the solid wood prevent absorption?

Here is a drawing of what I am suggesting- it might make more sense to see it.
Attachment 96600
Which of these two would provide the best broadband absorption? Is leaving the back exposed to air significantly important to the performance?

I would go with the second one.

Glenn

[Weasel9992]

Originally Posted by DarkEcho

I don't quite follow, how does angle iron work to space panels off of a wall?

Buy L-shaped angle iron...short part of the L should be around 2", long part can be as long as you need it to be...probably 6" in your case. Drill the first couple of inches of the long leg into the inside frame of the trap. The short leg you'll secure to the wall using the wall anchors. That'll give you your required 4" of stand off space from the walls. Some angle iron comes pre-drilled with holes, but if not you can drill them yourself. That's what I prefer.

Frank

[hduncan]

Originally Posted by Weasel9992

Buy L-shaped angle iron...short part of the L should be around 2", long part can be as long as you need it to be...probably 6" in your case. Drill the first couple of inches of the long leg into the inside frame of the trap. The short leg you'll secure to the wall using the wall anchors. That'll give you your required 4" of stand off space from the walls. Some angle iron comes pre-drilled with holes, but if not you can drill them yourself. That's what I prefer.

Frank

I think I know what you are talking about now, but are you sure it's called angle iron? I did a search and could only find objects like this:


What you are talking about is similar in shape, but not like 10" wide, and one of the sides is longer, instead of both being the same length, like above?

[Weasel9992]

I might be wrong about what it's called specifically. Just head to your local hardware store...it'll be in the same section it hinges and other L-shaped brackets.

Frank

[jdg]

this is what i used on my ceiling:

[hduncan]

Would you mind resubmitting that photo? it's not worked for me on two different computers.

I really like the idea of using a backer frame so that you can keep more of the fiberglass material exposed. ReadyAcoustics has a youtube video and a PDF of it I believe.

My only thing with that idea is that I'm not sure that if, over time, the corners of the fiberglass boards will get smushed down... I'd almost want to put some sort of corner support on each of the 4 corners to distribute the tension of the fabric..

Maybe a peice of angle iron (like the one I posted) would be good for that purpose..

BY THE WAY- Frank, you are right about it being called Angle iron- I went to the hardware store and there they were, just like you had described. Sometimes Google images fails me.