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 Post subject: Acoustic Foam
PostPosted: Sun Jan 15, 2017 4:44 pm 
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Hey guys
Got some 1-1/2" Acoustic foam given to me and I know its not the best stuff out there but it does look cool
Any objections in using the foam to cover the crappy ceiling I have in my listening room? Can't hurt right? Or will it?
Just thought I would get everyone's opinion before I invest the sweat equity...

Thanks everyone
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 Post subject: Re: Acoustic Foam
PostPosted: Sun Jan 15, 2017 4:59 pm 
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Lots of controversy over the use of acoustic foam and as many opponents as proponents. It does certain things at certain frequencies very well but fails miserably at others. IMO, it is best used WITH other materials in the places and for those frequencies where it excels in combination with thoe other materials that work best at other problem frequencies.

As such, it is fairly easy to DIY, but if you ae not working from a carefully engineered plan as to amounts and placement, it is really more miss than hit.


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 Post subject: Re: Acoustic Foam
PostPosted: Sun Jan 15, 2017 5:02 pm 
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Too much absorption eats up the mids and highs and leaves the bass boomy at +10db or more.

Best practice and good sound, says it's a non-no.

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 Post subject: Re: Acoustic Foam
PostPosted: Sun Jan 15, 2017 5:34 pm 
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Would it be ok to use it just on the first point of reflection on the ceiling?

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 Post subject: Re: Acoustic Foam
PostPosted: Sun Jan 15, 2017 6:22 pm 
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What kind of acoustic foam?

The kind that is like egg crates?

You might want to start in corners, and then also in reflection points on the side walls.

Reflection points is viewed with a small mirror on side wall, there is where you install them

Might also be the same on ceilings.

Do it progressively until clap echo with your hands is absorb, but not too much, you want to trim down echo a bit.


http://acousticsfreq.com/where-to-place ... e-theater/


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 Post subject: Re: Acoustic Foam
PostPosted: Sun Jan 15, 2017 6:38 pm 
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All 1-1/2" foam panels will do is attenuate high frequencies so significant application of it will dull the sound. Not typically a great thing...

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 Post subject: Re: Acoustic Foam
PostPosted: Mon Jan 16, 2017 7:01 am 
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kawihornet wrote:
Would it be ok to use it just on the first point of reflection on the ceiling?



Distributed echo control, and distributed first reflection control, is what it is good for. I've done every kind of room there is, including Live end/dead end, with multiple versions of that alone....

I just saw mention of someone using Jim Smith's 'get better sound', and it should have some details on this subject inside of it. I've personally never cracked his book open (have no copy), but it might fill the bill, as a relative compendium.

Getting the bass fixed is the biggest problem you will ever face. The rest (~400hz and up) is just about moving stuff around the room, the odd wall hanging and what not.

Bass is the toughest problem you face... and less than 1 in 50, maybe less than one in 100, manage to get it done. The vast number of studios are only dealing with it half way. It's tough. The toughest problem in acoustics. Which is why even the professional standards have it removed from their specification.

It's not even in their spec. In the graph in the above link,..A...B...C.. and D all have no bass considerations.

If one builds a studio to those specs, it generally is a fail.

The lesson is to concentrate (to some degree) efforts at functional bass control... and the rest is relatively cheap and free.

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 Post subject: Re: Acoustic Foam
PostPosted: Mon Jan 16, 2017 7:30 am 
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Unless you take before and after measurements, you really can't tell whether exactly it will be better or worse than what you currently have (from a measurement point of view). Your room and the objects in it and the dispersion characteristics of your particular speakers would be relevant parts of the equation.

But as you mentioned, it might look cool and therefore probably 'sound' better.

As mentioned, you can take the 'life' out of the music and make it dull sounding if you over-do sound absorption. Don't over-look the benefits of dispersion treatments and playing around with amount of toe in when it comes to the higher frequencies.


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 Post subject: Re: Acoustic Foam
PostPosted: Mon Jan 16, 2017 7:38 am 
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Whatever you do, be careful with open flames around the foam.

Nasty stuff.


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 Post subject: Re: Acoustic Foam
PostPosted: Mon Jan 16, 2017 8:02 am 
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kawihornet wrote:
Would it be ok to use it just on the first point of reflection on the ceiling?

Yes.
Also if your bulkhead is running left to right as per previous pic you could also treat the front face.

100% absorptive ceiling will acoustically seem like a higher ceiling.

Gary


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 Post subject: Re: Acoustic Foam
PostPosted: Mon Jan 16, 2017 8:29 am 
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drywhitetoast wrote:
Whatever you do, be careful with open flames around the foam.

Nasty stuff.


+1

The more expensive foam has some fire rating...not great but it has some retardant properties. The cheap stuff off of eBay etc. does not. I would be concerned putting it large areas in my home.

Paul

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