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Ceeling cloud over a drum.
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ANALogic
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#1
25th May 2013
Old 25th May 2013
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Ceeling cloud over a drum.

I'm going to build an adjustable ( for different air gap ) ceiling cloud to put over my drum while tracking.

Since I have no $ ( to precise no euro because of crisis-no job here in Italy) I have to build it myself ...
I also know , even if I have work skills , that I can do an useless job..

So my question is :

What i have to buy ?
Some Rockwool 70kg/m3 , or the 40kg/m3 ( cheaper ) ?
Or is better buy the 100kg/m3 ?

Im going to build the cloud chassis with pine wood ( already have at home ) and I'm thinking of a 2 ,40 m x 2,40 m x 10 cm ( 8 feet x 8 feet x 4" depth ) ,
Any advice?

Mine is a slope ceiling with 2,8 to 3,4 m. In 4x6 m room .
Wood floor.

( Sounds good but seems the cymbals are too loud)
#2
25th May 2013
Old 25th May 2013
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Clouds

Most commercial traps are 100KG. It doesn't sag but it's expensive and hard to find.
You can calculate the performance of lighter materials using this Porous Absorber Calculator - Results
The Gas Flow Resistivity numbers may be here or you may get them from the manufacturer. Common Gas Flow Resistivity numbers.

Some materials are simply better performers, e.g. Isover High Performance Duct Cladding or the Roxul products. Look for acoustic absorption specs.

I like to use several smaller panels with gaps between. e.g. 600 x 1200mm
Best DIY Trap EVER

DD
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25th May 2013
Old 25th May 2013
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"drumbrella's" are pretty popular - you can make a frame from lumber or metal and attach the absorption to it. using an electric or manual hoist to raise and lower if you have the ceiling height.

otherwise some strong eye hooks and chains can be use to selectively raise or lower a normal floating cloud.
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25th May 2013
Old 25th May 2013
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I used 4pcf mineral wool and aluminum angles for my cloud. It hangs on chains from eye hooks. Very light, but the aluminum wasn't cheap. Look around for something similar, you might be able to find the same thing for less.
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26th May 2013
Old 26th May 2013
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So you suggest me 100kg/m3 for broadband traps and little frames ?
let say 120 X 60 cm ( standard dimensions of mineral wool panels here)
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27th May 2013
Old 27th May 2013
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Hey amigos!
I've found it at 50 euros for pack (10 panels of 100kg/m3 ) .

It's enough build the bass trap 8cm height? ( 3" )
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29th May 2013
Old 29th May 2013
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Maybe double them for a cloud. Use the chains to adjust the air gap, all the while testing to guarantee the best results.
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29th May 2013
Old 29th May 2013
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Quote:
Originally Posted by OpusOfTrolls View Post
Maybe double them for a cloud. Use the chains to adjust the air gap, all the while testing to guarantee the best results.
So 6" ( 16 cm ) height will perform better ?

Does anyway a 4" trap ( 40kg/m3 ) work better than some acoustic foam ?
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29th May 2013
Old 29th May 2013
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Is the foam 4" thick?
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29th May 2013
Old 29th May 2013
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Rockwool / Fibreglass will perfom better at lower freqeuncies than foam. Foam kicks in about 250hz so ok for the higher / mid frequncies
Here's some testing results we did in our own lab comparing the two -
Comparing Foam to GIK 244 Bass Traps
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ANALogic
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29th May 2013
Old 29th May 2013
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Quote:
Originally Posted by OpusOfTrolls View Post
Is the foam 4" thick?
Is 3" thick.

I dont understand how thick I have to make my bass trap and IF Can i use the 40kg/m3 Rockwool
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29th May 2013
Old 29th May 2013
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Sorry double post
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29th May 2013
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Make it at least 4 inches thick and yes you can use your 40kg.m3 fibre glass but really you would want the 60kg3 and use the 40kg 3 in the corners
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29th May 2013
Old 29th May 2013
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Quote:
Originally Posted by sheggs View Post
Make it at least 4 inches thick and yes you can use your 40kg.m3 fibre glass but really you would want the 60kg3 and use the 40kg 3 in the corners
Is not fibre glass..
I can find Only rock wool , maybe it has less density?
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29th May 2013
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Sorry rockwool is the same. the 40kg3 is the density of the product. The more kg3 the denser the material
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29th May 2013
Old 29th May 2013
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Let's go with 5" ( 12 cm ) thick of 40kg/m3 then!

I hope is broadband enough !

Thanks a lot!
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29th May 2013
Old 29th May 2013
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Good luck
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14th June 2013
Old 14th June 2013
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Ceeling cloud over a drum.-imageuploadedbygearslutz1371234271.057721.jpg Name: ImageUploadedByGearslutz1371234271.057721.jpg Views: 87 Size: 59.2 KB ID: 349372" style="margin: 2px" />Ceeling cloud over a drum.-imageuploadedbygearslutz1371234296.354488.jpg Name: ImageUploadedByGearslutz1371234296.354488.jpg Views: 83 Size: 75.0 KB ID: 349373" style="margin: 2px" />

Yeah?
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