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New acoustic panels - air gap or no?...

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New acoustic panels - air gap or no?...

Postby Gadget13769 » Thu Nov 29, 2012 12:01 pm

I have two new fibreglass panels (1150mm x 575mm x 50mm) to go on my back wall...

... so, following on from recent discussions elsewhere on the subject, will I see any real benefit from spacing the panels with a 50mm air gap from the wall? Or will this be so subtle in this case as that I might as well just fit them flush?

Discuss...
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Re: New acoustic panels - air gap or no?...

Postby Gadget13769 » Thu Nov 29, 2012 12:08 pm

Here they are...

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Re: New acoustic panels - air gap or no?...

Postby Hugh Robjohns » Thu Nov 29, 2012 12:34 pm

Spacing them from the wall will extend the absorption to a lower frequency and it is worth doing if you can.

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Re: New acoustic panels - air gap or no?...

Postby GIK Acoustics » Fri Nov 30, 2012 4:50 am

Hugh Robjohns wrote:Spacing them from the wall will extend the absorption to a lower frequency and it is worth doing if you can.

hugh

+1. Though, two panels likely won't make a massive difference in the room. I would certainly suggest enough to hit the reflection points as well as some corner bass traps, and if its necessary, add from there.
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Re: New acoustic panels - air gap or no?...

Postby Gadget13769 » Fri Nov 30, 2012 9:32 am

GIK Acoustics wrote:+1. Though, two panels likely won't make a massive difference in the room. I would certainly suggest enough to hit the reflection points as well as some corner bass traps, and if its necessary, add from there.

Indeed.

I already have two corner chunks to go in the back corners, two panels for the back side wall, two panels for left/right reflection points, two larger front corner chunks and a large ceiling cloud.

I'm also going to get a couple more panels to go behind the monitor speakers, a panel on the back angle of my console and possibly an angled panel between the front wall and ceiling.

This is the front of my room so far...

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Re: New acoustic panels - air gap or no?...

Postby sheggs » Fri Nov 30, 2012 12:25 pm

Looking Good
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Re: New acoustic panels - air gap or no?...

Postby Gadget13769 » Fri Dec 07, 2012 6:32 pm

sheggs wrote:Looking Good

Thanks

So, to slightly alter the question...

If I'm now using 100mm of space from the wall (ie: 50mm panel + 50mm air gap), would I get better performance by just having a 100mm thick panel and no air gap?

(I realise 100mm panel + 100mm gap would be even better, but 100mm total is pretty much the maximum I can afford to use in this small room).
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Re: New acoustic panels - air gap or no?...

Postby Hugh Robjohns » Fri Dec 07, 2012 6:46 pm

Not really, and it would be a lot heavier and a lot more expensive.

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Re: New acoustic panels - air gap or no?...

Postby Gadget13769 » Fri Dec 07, 2012 6:56 pm

Hugh Robjohns wrote:Not really, and it would be a lot heavier and a lot more expensive.

H


I can get the 100mm thick panels for about 1/3 more cost than for the 50mm, so the cost isn't prohibitive, but if there is no likely performance gain, then perhaps I should go with 50mm panel + 50mm air, as you suggest.

The weight isn't too bad. The panels I am using are fibreglass surrounded by 2mm MDF, so a 1150mm x 575mm x 50mm panel is only 3kg.
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Re: New acoustic panels - air gap or no?...

Postby GIK Acoustics » Tue Dec 11, 2012 4:31 am

Sorry Hugh but I must disagree. There is a significant difference between a 2" panel with a 2" gap and a 4" panel from what I've seen(especially in corners, for obvious reasons). And fiberglass/mineral wool isn't all too heavy anyways .

I recommend making 100mm thick panels as a minimum unless your goal is only to tame reflections.
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Re: New acoustic panels - air gap or no?...

Postby Gadget13769 » Fri Dec 21, 2012 6:35 pm

*Update*

I have ordered 100mm thick panels for the back wall. I have used my 50mm panels on the side walls, with a small air gap... http://www.4x12.com/side_panels.html

I have also just put up a new page about my folding door bass trap... http://www.4x12.com/door_trap.html
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Re: New acoustic panels - air gap or no?...

Postby RitchieM » Sat Dec 22, 2012 12:40 am

Wow!!!!!

That room looks amazing! I wouldn't get anything done, just sit in it with a sense of serenity and feeling of pride!

I don't think I can step into my own little box anymore, you have ruined me.



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