PDA

View Full Version : Inside Boxes...



95Prober
12-29-2004, 11:59 AM
HI, i heard somewhere, correct me if im wrong, that when you make a sb box with MDF, that by applying some minwax or some kinda sealer or something i dont know exactly, that it may help. it read that since the MDF is porous it smoothes and fills the pores. not sure if this is true or not. anyway, if you laugh, i didnt make this up, its hearsay! haha

ANeonRider
12-29-2004, 11:59 AM
mdf isnt porous.

95Prober
12-29-2004, 12:11 PM
well maybe i read wrong. well, does the inside need to have anything to be applied to it ? i mean would any application help or not??

Nikuk
12-29-2004, 12:14 PM
well maybe i read wrong. well, does the inside need to have anything to be applied to it ? i mean would any application help or not??

help what? what are you trying to accomplish? wax will do you no good in a sealed.... polyfill wont necesarily help you in a bandpass...

Explain what it is that you're doing.

95Prober
12-29-2004, 12:28 PM
sorry, well its a sealed box application. just wondering if i have to apply anything to the inside walls ?? i heard somewhere that you can help the sound out by applying something. but like i said, its reading hearsay!

Nikuk
12-29-2004, 12:40 PM
Ahhh okay. You're prolly looking for Polyfill. It can help bring down the Q of a small sealed enclosure.

95Prober
12-29-2004, 12:46 PM
no,no, its supposed to be applied to the inside walls.

Nikuk
12-29-2004, 12:53 PM
well.... if you really want to you could was the inner walls of a sealed box. I mean, all the cool kids are doing it.

95Prober
12-30-2004, 02:03 PM
which is supposta mean...?

ieatdrt
12-30-2004, 02:58 PM
I think what they're trying to say is don't bother doing anything to the inside surfaces of an MDF sealed enclosure. Screw it, glue it, and run away. If she's pissed about the extra glue give her some soap.

cjj2d
12-30-2004, 02:59 PM
I too have read somewhere that people use one of the products used in fiberglassing to coat all the walls. It was mainly just to ensure a perfect seal and no air getting through. But I just use good sealant/caulk to do the job. Seems to work just fine.

ANeonRider
12-30-2004, 03:51 PM
resin....

Nikuk
12-30-2004, 03:57 PM
Wax It! Wax It! Wax It! Wax It! Wax It! Wax It! Wax It! Wax It! Wax It! Wax It! Wax It! Wax It! Wax It! Wax It! Wax It! Wax It! Wax It! Wax It! Wax It! Wax It! Wax It!

radel2dope
12-31-2004, 06:33 PM
The February 2005 issue of CarAudio and Electronics addressed this issue when relating it to SPL. Spraying on something on the inside will not help SPL at an audible level, but in some cases might raise SPL a couple of tenths of a dB. But in your case, as long as you do a good job making the box, there should be no need to spray on anything, especially with MDF.

Nikuk
12-31-2004, 06:41 PM
The February 2005 issue of CarAudio and Electronics addressed this issue when relating it to SPL. Spraying on something on the inside will not help SPL at an audible level, but in some cases might raise SPL a couple of tenths of a dB. But in your case, as long as you do a good job making the box, there should be no need to spray on anything, especially with a sealed MDF box.


:D

MisterE
12-31-2004, 08:29 PM
sealed or ported, applying resin to the walls has helped some people raise their SPL score tenths of a point. it makes the walls more ridgid and reflective

Nikuk
12-31-2004, 08:33 PM
Show me one person that resined the inside of a sealed box and gained on the TL.

Please.

Seriously.

jellyfish420
12-31-2004, 09:21 PM
Show me one person that resined the inside of a sealed box and gained on the TL.

Please.

Seriously.
this is true...if the wall is big enough to flex then some resin might help alittle.....

Nikuk
12-31-2004, 09:23 PM
.... LOL That's great....

amedeuce
12-31-2004, 09:26 PM
mdf isnt porous.


It isn't, then why does it **** up paint and anything else you put on it?
It is porous.
And there really isn't a need to seal the inside of a box with polyurethane or paint or whatever else, but it can't hurt. Sealing it inside or out would help if you spill water on it or other liquids that would absorb into the mdf.

amedeuce
12-31-2004, 09:30 PM
this is true...if the wall is big enough to flex then some resin might help alittle.....


Why not just brace it then?

MisterE
01-01-2005, 02:49 AM
lots of people have (http://www.caraudioforum.com/vbb3/showthread.php?t=187375&page=1&pp=15)

oh, and here (http://www.caraudioforum.com/vbb3/showthread.php?t=197740&page=1&pp=15)

evidence.....do you think i just made that up?

soundessence1
01-01-2005, 11:23 AM
I resined the inside and out of a sealed enclosure and polyfilled it, didn't notice much..... i thought my box was gonna fly apart with my juggy in it

Nikuk
01-01-2005, 12:22 PM
lots of people have (http://www.caraudioforum.com/vbb3/showthread.php?t=187375&page=1&pp=15)

oh, and here (http://www.caraudioforum.com/vbb3/showthread.php?t=197740&page=1&pp=15)

evidence.....do you think i just made that up?

Okay, I read those two pages for you. All of those installs were regarding ported.

You're stating that resin in a sealed box will bring up a TL score. I want to see where this has happened.

Nikuk
01-01-2005, 12:22 PM
Show me one person that resined the inside of a sealed box and gained on the TL.

Please.

Seriously.

For reference's sake....

MisterE
01-01-2005, 03:30 PM
applying resin is basically another form of bracing, it makes the walls stronger and more ridgid (less susceptible to vibrating), its the same idea as if you double walled your box, it would be stronger and lose less due to lesser vibrating and flexing of the walls. and since it would lose less "power" it would be louder. but we're talking tenths here.

but really i could care less if you "believe" it or not, you seem like an ignorant *** anyways :-D

Nikuk
01-03-2005, 01:00 PM
applying resin is basically another form of bracing, it makes the walls stronger and more ridgid (less susceptible to vibrating), its the same idea as if you double walled your box, it would be stronger and lose less due to lesser vibrating and flexing of the walls. and since it would lose less "power" it would be louder. but we're talking tenths here.

but really i could care less if you "believe" it or not, you seem like an ignorant *** anyways :-D

So you're giving advice without having any proof to support it? That makes ME the ignorant one?

Come use my TL and show me...

MisterE
01-03-2005, 03:59 PM
i would if i werent homophobic

InhumanAcura
01-03-2005, 04:16 PM
eh

Nikuk
01-03-2005, 04:38 PM
i would if i werent homophobic

:handclap:

Brilliant, absolutly brilliant.

Black_Jesus
01-03-2005, 11:56 PM
It isn't, then why does it **** up paint and anything else you put on it?
It is porous.
And there really isn't a need to seal the inside of a box with polyurethane or paint or whatever else, but it can't hurt. Sealing it inside or out would help if you spill water on it or other liquids that would absorb into the mdf.po·rous http://cache.lexico.com/dictionary/graphics/AHD4/JPG/pron.jpg (https://secure.reference.com/premium/login.html?rd=2&u=http%3A%2F%2Fdictionary.reference.com%2Fsearch%3 Fq%3Dporous) ( P ) Pronunciation Key (http://dictionary.reference.com/help/ahd4/pronkey.html) (pôrhttp://cache.lexico.com/dictionary/graphics/AHD4/GIF/prime.gifhttp://cache.lexico.com/dictionary/graphics/AHD4/GIF/schwa.gifs, phttp://cache.lexico.com/dictionary/graphics/AHD4/GIF/omacr.gifrhttp://cache.lexico.com/dictionary/graphics/AHD4/GIF/prime.gif-)
adj.

Full of or having pores.
Admitting the passage of gas or liquid through pores or interstices.
Easily crossed or penetrated.

it ***** up paint because it is pressed sawdust... not because it has holes.. which it shouldnt, if it does, its ghetto mdf... ;) should be perfectly smooth all over:ladysman:

gunny86
01-04-2005, 04:25 AM
Applying resin to the inside of any enclosure will help, it will make a better air tight seal (plus add strength and other factors, etc) which mdf can not make. Yes the difference between resin or not is small, but if you want to prove it to yourself take 2 pieces of 3/4 mdf put one on top of the other and then take your shop vac hose and put it on the top of the first piece of mdf, now lift up on the hose and both pieces will come off the ground and be stuck together.

Air can be pushed and pulled though mdf, this means sealing off the entire internal surface of your enclosure (coating with resin) will make a difference, ESPECIALLY in "sealed" enclosures, and enclosures with a powerful driver that can move alot of air.

So the more sealed your enclosure is the better your driver is going to work with it, ect. right? So that means that yes you could possibly get a higher TL score with a true air tight "SEALED" box.