Building the Ultimate Box

[TD89 10+ year member]

I'm going to try building my first box (sealed) to house 2 MB Quart Premium 10s. I want to use 1" MDF board to build the box and then cover the inside with Second Skin Damplifier Pro. Then I'm planning on putting Acousti-Stuff http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=260-317 inside the enclosure.

Is there anything I could do differently to get better results? What do you guys think of my plan for thix box?

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[Beat_Dominator 5,000+ posts]

You don't HAVE to have anything inside.... but it probably won't hurt to try some deadeners.

 

[PV Audio 5,000+ posts]

I'm not sure as to why you'd put deadening on the inside of the enclosure. Use bracing, it is much MUCH more effective and won't waste you money (scraps = free).

 

[Ignatowski 5,000+ posts]

sealed is sealed

You can line it inside and out but it wont change the SQ

SEALED means just that its sealed weather it be with glue and nails

or deadner

3/4 MDF is more than enough for your subs,but if you want to break your back

knock yourself out with 1"

 

[req 5,000+ posts]

okay man. go for all that extra crap.

because you know what? none of it will make a difference in sound with those drivers and a sealed enclosure //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

you might as well send me the extra monies you are spending to do this, and just use 3\4" mdf, because thats the best way to spend those monies.

and by the way, spending $7+shipping on a bag of stuffing is pretty **** expensive. you are better off going to kmart and buying a few of the cheap ass pillows and stuffing that inside your box. its all the same crap.

 

[TD89 10+ year member]

I'm not sure as to why you'd put deadening on the inside of the enclosure. Use bracing, it is much MUCH more effective and won't waste you money (scraps = free).

I really didn't think deadening or sound dampening is necessary in a box, and most of you think the same way apparantly, but some of the people I've been talking to that are into high-end home audio say you should always put in sound damping to control the air movement even in a sealed enclosure. Supposedly the air moving back and forth in the enclosure will negatively impact the efficiency of the driver and the more you can minimize that the better, deeper sound you can get.

And how do you do bracing and what does it accomplish? By making the structure more solid what does it do to the sound?

 

[PowerNaudio 10+ year member]

you realy whant to brace the enclosure to limit flexing. you can line the inside walls with sound deadning mat to absorb as much of the back wave as posible it does improve sound. or line the walls with fiberglass insulation or polifill . to further tune the enclosure in the case you made the enclosure too small you can fill it to a surtain % with polyfill to fool the sub into feeling its in a bigger box by slowing the air inside the enclosure.

 

[TD89 10+ year member]

Thanks for all the help! I'm a little bit confused about how to do the bracing. What exactly do I need to do to brace up the inside of the box?

 

[trow100 10+ year member]

Don't waste your money on 1" think wood. I have 2 SI Mag's which weigh 31 pounds each and wang like crazy, i'm using 3/4 and have no problem.

 

[TD89 10+ year member]

to brace, just put triangles in the corners of the box, just to stiffen it. or, you could make a square of mdf with a cross goin thru it, and put it inside the box.

Does bracing help the sound of the box? Since 1" MDF is overkill anyway would it actually help?

 

[PV Audio 5,000+ posts]

Bracing helps to eliminate panel resonance which colors the sound. So it CAN (depending on size of box naturally) lower coloration. Think about it like this. If the sound off the front of the sub can rip off your rear view mirror, and the sound off the back is identical (180 degrees outta phase tho), imagine what's happening in the box //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[soul05 10+ year member]

i bought a 1 lb of polyfil at myt local michaels for 2 bucks haha

 

[dleccord 5,000+ posts]

yeah everyones right, but wait ... it says the ultimate box