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confused about foam
Old 13th March 2019
  #1
Gear Addict
 

confused about foam

most of the posts here on gearslutz say forget foam

I recall being in a test lab of a major computer manufacturer and
inside was a room lined with foam pyramids on all walls
and as i recall the ceiling too but not the floor

they used it to make noise measurments of their gear

when you walked in it was like the sound was sucked out of your ears
the most eeriest feeling I have ever had.

if foam is so bad then how could that room have been so super dead quiet ?
Old 13th March 2019
  #2
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It's not so much that foam's absorption isn't at least similar to fiber given -actual- equal thickness-, more the costs for the thicknesses typically needed.
In our studio/recording rooms we are tackling room resonances extending into low frequencies, needing panels thick enough to address them.
In this case they may have built a stout tight enclosure giving the isolation -and low internal noise level- with a remaining need only to address higher frequencies. (How deep were the foam treatments BTW?

Also consider comparing these products -cut out/notched (vs flat/fiber) that 'depth spec is only at the peaks. With the rest of the product effectively much thinner.
Old 13th March 2019
  #3
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avare's Avatar
 

Wayne wrote great. Ading to that we in studio design consider 10 dB reduction good. In anechoic chambers 20 dB is the norm. The wedge shape is to rduce reflections.

Andr
Old 13th March 2019
  #4
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Quote:
Originally Posted by avare View Post
Wayne wrote great. Ading to that we in studio design consider 10 dB reduction good. In anechoic chambers 20 dB is the norm. The wedge shape is to rduce reflections.

Andr
Thanks. I figured the shape was to help reduce reflections.
But my ears said that room was more than 20dB quieter.

It was a long time ago but I would say it was more like 30-40dB.
That place just sucked the sound out of your ears and was creepy scary.

Now , again, this was a major computer manufacturer who could afford to spend what it took to make that room perfect for their measurements.
Old 13th March 2019
  #5
Gear Addict
 

Quote:
Originally Posted by Wayne View Post
It's not so much that foam's absorption isn't at least similar to fiber given -actual- equal thickness-, more the costs for the thicknesses typically needed.
In our studio/recording rooms we are tackling room resonances extending into low frequencies, needing panels thick enough to address them.
In this case they may have built a stout tight enclosure giving the isolation -and low internal noise level- with a remaining need only to address higher frequencies. (How deep were the foam treatments BTW?

Also consider comparing these products -cut out/notched (vs flat/fiber) that 'depth spec is only at the peaks. With the rest of the product effectively much thinner.

Thanks.

This was a MAJOR fortune 100 company and they spent the money they needed to get the room right for testing their computer gear for noise. So that foam was THICK. I am guessing the pyramids were about a foot on each of the sides and about that tall, all pointed out into the room.
Old 13th March 2019
  #6
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avare's Avatar
 

Its not as if they advertise their acoustic services on the internet.

IBM
Old 13th March 2019
  #7
Gear Addict
 

Quote:
Originally Posted by avare View Post
Its not as if they advertise their acoustic services on the internet.

IBM
The don't offer the service to anybody but engineering groups at IBM.
At least back when I worked at their test lab.

I see from the link that now they do. Thanks for that update.
Been a while since I looked at them and their activities.
Old 17th March 2019
  #8
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