epoxy resin vs polyester resin sealing inside subwoofer box

[mlstrass 5,000+ posts]

There is a huge gain in strength when you turn anything into a monocoque-like structure.
Also, have you ever tried breathing very fast or hard through certain fabrics or whatever and had a tough time, but when you breath easy and slow through it there's no problem? That's the concept behind aperiodic membranes, they become more resistive to higher velocities. MDF is porous, period. There are losses built into modeling programs that acknowledge facts like these.

So is a ported box breathing slow or fast? And it has a huge hole it anyway, so I highly doubt it makes a diff...

As for strength, I've yet to have a box come apart, birch or MDF and I don't do any of that **** to them. My last wall had single layer panels in several places and had no problem doing a 60+...

 

[akadj 10+ year member]

So is a ported box breathing slow or fast? And it has a huge hole it anyway, so I highly doubt it makes a diff...
As for strength, I've yet to have a box come apart, birch or MDF and I don't do any of that **** to them. My last wall had single layer panels in several places and had no problem doing a 60+...

but as for the density of wood compared to steel, glass, granite. ect.. wood alone will absorb more of the sound wave then heavy or more dense material. .

Approximate weights per cubic foot:

mdf - 48lbs

epoxy resin - 130lbs

concrete - 150lbs

glass - 162lbs

steel - 489 lbs

see where I'm going with this?

 

[akadj 10+ year member]

also note that the Rockwell hardness test of mdf is 3 while resin is 110

I think the key to this consists of three things.

1- density

2- hardness

3- surface finish

 

[ciaonzo 5,000+ posts]

So is a ported box breathing slow or fast? And it has a huge hole it anyway, so I highly doubt it makes a diff...
As for strength, I've yet to have a box come apart, birch or MDF and I don't do any of that **** to them. My last wall had single layer panels in several places and had no problem doing a 60+...

I wasn't really talking about how fast the driver forces air in and out of a vent (which is a wide open area, not was I was asking you to picture), I was mainly addressing structural integrity and sealed enclosures to discuss the principal idea here, MDF being porous or not. My guess is if you wanted to get into surface roughness, drag coefficients for the various types, and wind speed as it pertains to laminar air flow, you would still be a off a bit in your thinking.

 

[AxT4430 10+ year member]

I wasn't really talking about how fast the driver forces air in and out of a vent (which is a wide open area, not was I was asking you to picture), I was mainly addressing structural integrity and sealed enclosures to discuss the principal idea here, MDF being porous or not. My guess is if you wanted to get into surface roughness, drag coefficients for the various types, and wind speed as it pertains to laminar air flow, you would still be a off a bit in your thinking.

what is your degree?? lmao

 

[ciaonzo 5,000+ posts]

what is your degree?? lmao

Ha... I wish.

 

[akadj 10+ year member]

now thats going into the direction I was thinking with coefficient and wind speed.. if were adding 45's might as well add glass too

smooth air flow with a hard reflective surface

 

[AxT4430 10+ year member]

Ha... I wish.

So, are you a self taught dynamics freak?

 

[AxT4430 10+ year member]

@ciaonzo; I just got clarion cz702 get a plane ticket and come tune it! lol

 

[ciaonzo 5,000+ posts]

lol

But then you won't learn how to yourself! //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[AxT4430 10+ year member]

lol
But then you won't learn how to yourself! //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

ciaonzo seals his epistemic knowledge with ambiguous responses!

But true.. I need to have a couple nights with diyma.com

I basically have the concept of cross over points plus slopes.. master that, then T/A .. Then tearing my car apart, and selling some lesser quality audio stuff!

 

[ciaonzo 5,000+ posts]

ciaonzo seals his epistemic knowledge with ambiguous responses!
But true.. I need to have a couple nights with diyma.com

I basically have the concept of cross over points plus slopes.. master that, then T/A .. Then tearing my car apart, and selling some lesser quality audio stuff!

Sorry, I hope you don't feel put off. It really is fun tuning and tweaking, you will love it. Even after you get it right you'll keep changing it, lol. They call us tweakers for a reason.

 

[AxT4430 10+ year member]

Sorry, I hope you don't feel put off. It really is fun tuning and tweaking, you will love it. Even after you get it right you'll keep changing it, lol. They call us tweakers for a reason.

Im fine haha. I think it will be fun!

 

[akadj 10+ year member]

heres a few pictures of glass enclosures and marble enclosures

 

[ciaonzo 5,000+ posts]

Wow, that's quite an undertaking. I can't imagine the cost involved with all that.