too large box

ryan750 · 15th May 2009, 06:30 PM

hi, is it possible to decrease the volume of a box??? hmm. dumping some stuff inside?? or something like that. tnx,

Thawach · 15th May 2009, 06:55 PM

yes u can decrease the volume of a box and put some stuff inside.

Richard Ellis · 15th May 2009, 07:34 PM

You have got it backwards...stufing a sealed enclosure with dacron or fibreglass will INCREASE the apperant size of the box.
The system will be increased 15% for Dacron, 18% for fibreglass.
Remember what happens when you compress air??It increases in temperature..adding stuffing adds a thermal mass that the air is trying to heat up...sinking the heat...making for an Isothermal process, rather than an Adiabatic process.
Myself I use Cotton batting..which I believe is superior, but can easily mold if moisture is present.
_________________________________________Rick.....

Cal Weldon · 15th May 2009, 08:06 PM

I think he meant to put some stuff inside, not stuffing as you rightly pointed out.

Yes, put something like pieces of wood or bricks to decrease the volume.

tinitus · 15th May 2009, 08:14 PM

Or line the inside with foam with closed cells, thats not acoustic transparent

Or like Cal says, use wood
Maybe a good idea to mount pieces of wooden sticks in all inside joints, with some kind of flexible glue

Bags with dry sand has also been used

Thawach · 15th May 2009, 08:38 PM

i ever did by bracing the box a lot.

Richard Ellis · 15th May 2009, 09:45 PM

My bad...I see now. Bag-O-sand..seems most simple, can take up a lot of volume. The added weight shouldn't be too bad, might reinforce the structure somewhat.
_______________________________________________Ric k...

Cal Weldon · 15th May 2009, 10:07 PM

I wonder if a bag of sand is dense enough or if it might act a bit like the fiber type stuffing?

I have always used old pieces of lumber when starting with oversized test boxes.

chris661 · 16th May 2009, 01:19 PM

The best I found was empty bottles, filled with water. This was you can choose the amount you reduce it by, to the nearest 1/2 litre.

Better start drinking that Coke....

gni · 16th May 2009, 05:28 PM

Why not sand in the liter bottles? The bottles is quite creative.

I glue blocks of wood. . . precise also. . . particle board is cheap and glues well.

15th May 2009, 06:30 PM	#1
ryan750 diyAudio Member Join Date: Oct 2007	too large box hi, is it possible to decrease the volume of a box??? hmm. dumping some stuff inside?? or something like that. tnx,

15th May 2009, 08:06 PM	#4
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	I think he meant to put some stuff inside, not stuffing as you rightly pointed out. Yes, put something like pieces of wood or bricks to decrease the volume. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

15th May 2009, 10:07 PM	#8
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	I wonder if a bag of sand is dense enough or if it might act a bit like the fiber type stuffing? I have always used old pieces of lumber when starting with oversized test boxes. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

16th May 2009, 01:19 PM	#9
chris661 diyAudio Member Join Date: Feb 2008 Location: Lancashire Blog Entries: 7	The best I found was empty bottles, filled with water. This was you can choose the amount you reduce it by, to the nearest 1/2 litre. Better start drinking that Coke.... __________________ "Throwing parts at a failure is like throwing sponges at a rainstorm." - Enzo My setup: http://www.diyaudio.com/forums/multi...tang-band.html

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15th May 2009, 06:55 PM	#2
Thawach diyAudio Member Join Date: Dec 2007	yes u can decrease the volume of a box and put some stuff inside.

15th May 2009, 07:34 PM	#3
Richard Ellis diyAudio Member Join Date: Sep 2006 Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.	You have got it backwards...stufing a sealed enclosure with dacron or fibreglass will INCREASE the apperant size of the box. The system will be increased 15% for Dacron, 18% for fibreglass. Remember what happens when you compress air??It increases in temperature..adding stuffing adds a thermal mass that the air is trying to heat up...sinking the heat...making for an Isothermal process, rather than an Adiabatic process. Myself I use Cotton batting..which I believe is superior, but can easily mold if moisture is present. _________________________________________Rick.....

15th May 2009, 08:14 PM	#5
tinitus diyAudio Moderator Join Date: Nov 2005	Or line the inside with foam with closed cells, thats not acoustic transparent Or like Cal says, use wood Maybe a good idea to mount pieces of wooden sticks in all inside joints, with some kind of flexible glue Bags with dry sand has also been used

15th May 2009, 08:38 PM	#6
Thawach diyAudio Member Join Date: Dec 2007	i ever did by bracing the box a lot.

15th May 2009, 09:45 PM	#7
Richard Ellis diyAudio Member Join Date: Sep 2006 Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.	My bad...I see now. Bag-O-sand..seems most simple, can take up a lot of volume. The added weight shouldn't be too bad, might reinforce the structure somewhat. _______________________________________________Ric k...

16th May 2009, 05:28 PM	#10
gni diyAudio Member Join Date: Sep 2006	Why not sand in the liter bottles? The bottles is quite creative. I glue blocks of wood. . . precise also. . . particle board is cheap and glues well.

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