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View Full Version : Thoughts on using sand as a filler in an enclosure.



cobra133
03-29-2005, 08:45 PM
Ok, here is what I want to do. I have two mtx thunder 6000 12" subs. I want to wire them in a custom built enclosure (I'm making this) and then make one side of the enclosure either 3/4" or 1" plexiglass for a window. Heres the trick. I want to make an enclosure that is about 2- 2 1/2 time the size that mtx recommends. The enclosure will be very tall and narrow. I want to fill the extra volume up with sand. I've heard of this being done before. It is supposed to completely deaden the enclosure and prevent rattles from occuring. This happens because the sand is really absorbant because of its mass. ANy thoughts?

Beat_Dominator
03-29-2005, 09:17 PM
I wouldn't recommend it because if any sand finds its way to the voice coil or into the pole your woofer is going to be screwed.

cobra133
03-29-2005, 09:23 PM
Hmm... I'm not sure if it would. I think the woofers would be about 2 feet away from the sand. I could also make a barrier with speaker grill cloth to prevent any sand from getting in. In fact, i think i will do that. thanks for the advice.

Moe Lester
03-29-2005, 09:23 PM
concrete

iceteebone
03-29-2005, 09:25 PM
with the pressure inside the box i would imagine you would have an actual western sand storm in your box.

cobra133
03-29-2005, 09:29 PM
Hmm... i think you are right about that sand storm. None the less. i can't help but feel it would truly deaden the enclosure.

Moe Lester
03-29-2005, 09:31 PM
use concrete... id like to see your sub blow that around :)

cobra133
03-29-2005, 09:32 PM
Any ideas on how to make this idea work?

cobra133
03-29-2005, 09:33 PM
Are you talking hardened concrete?

mattmcss
03-29-2005, 09:34 PM
you want the sand to just sit and not move ? u can mix the sand with a combo of water + glue mixed together and when it dries , wallaaaaaa

cobra133
03-29-2005, 09:40 PM
Actually, I kind of want it to move around. The thing is, i dont want any sand to get in the woofers.

THUNDERBIRD
03-29-2005, 09:59 PM
sounds retarded to me and d*** heavy. and with the prices of gas, ur crazy

iceteebone
03-29-2005, 10:06 PM
for a school project you can do a re-creation of the great american dust bowl.

JimJ
03-29-2005, 11:30 PM
Use stacked pieces of 1" MDF. 2 or 3 inch thick walls will not flex.

99Wolfsburg2.0
03-29-2005, 11:37 PM
How about simply...why are you making it bigger than is needs to be? why are you looking to use sand....why not just make it the right size?

jellyfish420
03-29-2005, 11:57 PM
How about simply...why are you making it bigger than is needs to be? why are you looking to use sand....why not just make it the right size?
right on;)

cobra133
03-30-2005, 08:25 AM
After a lot of though, and research. Here is how i'm going to do it. Make a correct size box for the subs. Then, place that box inside a larger box, and fill with sand. This oughta deaden it to the extreme.

99Wolfsburg2.0
03-30-2005, 09:36 AM
again....why...are you trying to kill the sound? what is your goal here...why do you need such a large box....

cobra133
03-30-2005, 09:42 AM
I'm trying to kill any vibrations that are caused by the enclosure its self. I also don't want it flexing at all.

iceteebone
03-30-2005, 09:49 AM
I'm trying to kill any vibrations that are caused by the enclosure its self. I also don't want it flexing at all.


some simple internal bracing, or doubling up some mdf should stop that.

tRiGgEr
03-30-2005, 09:58 AM
:word:
some simple internal bracing, or doubling up some mdf should stop that.

Just use dowels you terd. Two MTX 6000's will not tear your box apart if you use 3/4 to 1 inch MDF on your build. And if you want to be safe add like 4 3/4 to 1 inch dowels and you will be set. Sand is a retarded waste of time and effort. And your sure to get :waycrazy: this where ever you go.

cobra133
03-30-2005, 02:52 PM
True. I suppose i forgot to mention that i plan on upgrading to something much more powerful in the future. I'm not sure what kind of subs though. I'm open to suggestions.

tRiGgEr
03-30-2005, 03:41 PM
True. I suppose i forgot to mention that i plan on upgrading to something much more powerful in the future. I'm not sure what kind of subs though. I'm open to suggestions.

Well now that that is clear, What are you looking for. Pure SPL for comps. A great sounding driver that can get real loud, Uber loud but decent sound.

Basically

SQ
SPL
SQL

cobra133
03-30-2005, 03:59 PM
I'm not into SPL at all. I'm all about the SQ. But the 12's need to be able to get really loud too. I'm not talking 140db loud, but loud.

Moe Lester
03-30-2005, 04:52 PM
you are looking into this way to far lol. just make the walls all 1.5" thick and you will have NOTHING to worry about.

iceteebone
03-30-2005, 04:56 PM
gets some bricks and mortar and start building your box. you can also make a sandbox on top and build sand castles

bri487
03-30-2005, 05:37 PM
if you truely insist on using sand, first you must use some type of clear siding, whether it is lexan or plexi, i dont care i just want to see a video of the sand inside the box when playing. the other thing i would suggest is inverting the sub. even if you use some type of screen, it is still a lesser chance of sand getting in an essential mechanical part of the motor structure.

automotivations
04-01-2005, 01:55 AM
Why not put the sand in the bottom of the enclosure, then put another piece of mdf on top of that but leave some room for sand movement. Im not saying it will work, I just want to see what it will actually do. Or you could just lay a thick layer of polyfill over the top of the sand...

JimJ
04-01-2005, 02:06 AM
Ditch the sand...

use 1.5" thick layered MDF, resin over it, and use 1/4" allthread rod through it. Trust me, you won't need sand...and it won't flex.