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superchunk 30 cm (11.8inch) enough?
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loopus
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#1
24th May 2012
Old 24th May 2012
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superchunk 30 cm (11.8inch) enough?

Hello i would like to build superchunk corner traps...i live in italy and we dont have owens corning i have found a substitute with 50kg density which is recommended in other forums (isover e100s)
my room is 270x400cm high 205 (106.3x157.5 high 80.7 inches) the walls and ceiling are made of drywall...

i would like the bass trap triangle corner side to be 30cm (11.8) i know its not much but the room is not too big either...do you think it will be enough?
its also easy because the panels come in shape of 120 x60 cm so i could have exactly 16 triangles from each...

also i was thinking to 4 square panels 60x60 (23.6in) with a width of 10 (3.9) cm and some airgap in the back and 4 rectangular panels of 30x60 with a half width 5 cm 2 in to put in the corner of the walls with the ceiling...
i know it is not much but i wonder if for starting i will notice some difference....

thanks
mattei
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24th May 2012
Old 24th May 2012
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Quote:
i would like the bass trap triangle corner side to be 30cm (11.8) i know its not much but the room is not too big either...do you think it will be enough?
I really recommend making them no less then 17" on the sides. Will 11.8" work? Well it will absorb but not as low as you might want.

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24th May 2012
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Quote:
Originally Posted by Glenn Kuras View Post
I really recommend making them no less then 17" on the sides. Will 11.8" work? Well it will absorb but not as low as you might want.
+1.

Andre
loopus
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24th May 2012
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ok as most of the panels in europe come in shape of 120x60 cm i could cut it a panel in 36 small triangles of 20cm (7.9 in) and use 3 to build a corner of almost 17in (see pic)
in this way the superchunk is missing the actual corner but i guess it will work anyway
what do you think?
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superchunk 30 cm (11.8inch) enough?-corner.jpg  
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24th May 2012
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This way you´ll loose the "practical" side of making a superchunk, these "ultra mini" triangles will be difficult to deal with, in the end will be a mess unless you put some structure to fix it in the corner. I personally would not going less than 34" face (1 panel cutted 4 triangles) for effective absorption.

Ciro
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24th May 2012
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guys..thanks for all the suggestions...
my wall is 106'' though if i will cut the corner by the ideal 34'' i am going to loose more then half the wall just for the superchunks..i cant afford it...

i think i will have to find some compromise available space and absorption...

what about the panel 11.8x23.6 width 1.9 in the corner ceiling-wall...it is again too little?
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25th May 2012
Old 25th May 2012
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Size Matters

I agree with ciro, the bigger SSC's are much much better.
Since space is limited how about rectangular traps like GIK SoffiTraps?
Isover e100S looks like 100KG to me. It's Gas Flow Resistivity is high at 44,000.
This will be expensive and ineffective in thick traps.


DD
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25th May 2012
Old 25th May 2012
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Quote:
Originally Posted by DanDan View Post
I agree with ciro, the bigger SSC's are much much better.
Since space is limited how about rectangular traps like GIK SoffiTraps?
Isover e100S looks like 100KG to me. It's Gas Flow Resistivity is high at 44,000.
This will be expensive and ineffective in thick traps.


DD
Here is a picture of what the room would look like with a soffit design.

loopus
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25th May 2012
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ok you had me....i am convinced... will use less expensive rockwool and a side of 24" !!...

thanks for all the suggestions...
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27th May 2012
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Hey Loopus,

Just to add to the curiousity of a 17" side. It seems like a weird size, yeah?

Here's where 17" comes from:

Take a 120cm x 60cm panel
-Cut it in half
We are left with two 60cm x 60cm panels
-Cut both in half diagonally
We now have four triangles which are 60cm x 60cm x ~85cm (on the longer triangle side)
-Cut those in half diagonally again
We are finally left with eight triangles that are ~42.5cm x ~42.5cm x 60cm (on the longer triangle side)

Now, if we put two of those last triangles together on the 60cm side, we have a ~42.5cm square - which is a 17" square.

Odd way to do it, yes, but much more effective than 12", and most people don't have the space to do 24" soffits.

I'm sure the 24" / 60cm wide ones will work fantastically. Like I said, most don't have the space for it, but if you do..I bet they will work nice!
loopus
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27th May 2012
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so i built half of the superchunk (2 blocks of 110 cm) with the side of 60 cm (24") using some cheap rockwool and it sounds altready great...
its a brand new studio that i did with drywall and cheap fiberglass insulation, so i still not have mesured exactly the benefits of the corner traps but i can tell that i have never worked in such a good acoustics environment...
only thing it might be maybe slight not bassy enough but maybe is subjective because i was working in a overbassy environment before or maybe its because of my monitors (event xl8)..
thanks again to the forum
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27th May 2012
Old 27th May 2012
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Quote:
Originally Posted by DanDan View Post
Isover e100S looks like 100KG to me. It's Gas Flow Resistivity is high at 44,000.
This will be expensive and ineffective in thick traps.
Will it work as first reflections absorbers? Have some spare rigid panels...
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27th May 2012
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100KG

Julian, the 100KG is fine for simple thin panels, 50-100mm.
Dense material like this is often rigid enough to not need a frame.
I would still recommend a minimum of 100mm plus 100mm airgap at first reflection points.

DD
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28th May 2012
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superchunk 30 cm (11.8inch) enough?-100mm-100-kg-vs-17-5-kg-porous.gif
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28th May 2012
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Cryptic

Side Reflection panels are intended to absorb sound at angles of incidence closer to grazing than normal.
Julian has these 100KG panels already, plus they won't need frames which the 17.5KG floppy stuff will.

Name:  Screen shot 2012-05-28 at 03.00.00.jpg
Views: 680
Size:  76.4 KB

DD
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28th May 2012
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Thanks so much, Dan!

Gonna put them togheter and then add superchunks to my room´s corners!
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28th May 2012
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Quote:
Originally Posted by DanDan View Post
Side Reflection panels are intended to absorb sound at angles of incidence closer to grazing than normal.
Julian has these 100KG panels already, plus they won't need frames which the 17.5KG floppy stuff will.
This auto contradiction is daft.
Views: Size: ">Attachment-IRJDSUNE9932123321222xxeww-293907

DD
A first order reflection point (the most critical points) in a normal rectangular control room with equilateral (or close to equilateral) setup will never see a reflection coming from such high angle of incidence as 75 degrees. Up to about 30 degrees is more realistic:

superchunk 30 cm (11.8inch) enough?-100mm-100-kg-vs-17-5-kg-porous-30-degrees-incidence.gif


ISD gap for my room help pls!
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28th May 2012
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Point

You are welcome Julian.

Even at 30 degrees, the 100KG has twice the absorption at 125Hz.

It is worth noting that RealTraps, GIK, Primacoustic, etc. etc. all use 100KG fibre in panel traps.

DD
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29th May 2012
Old 29th May 2012
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Com'on guys, I thought we were over this. Can you not simply state your opinion, agree to disagree, and move on?

Thanks
Tim.
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