WRONG. Sound absorptive materials reduce the sound reflected back into a space and have little effect on the amount of sound transmitted through the surface.

Just because MDF absorbs water doesn't mean it is porous to air. Try breathing through a piece of MDF and see how long you stay conscious. I can guarantee you that MDF will reflect more sound back into a space than a rigid fiberglass panel will.

It would take too long to even begin to address the inaccuracies in the next section of comments, so I won't, other than saying that they are not accurate assumptions.

I have a BS in Engineering from Purdue. I studied physics, mechanical and electrical engineering, and theatre/audio. Besides that I have played musical instruments/listened to audio for the last 16 years.

I have worked on a couple of hundred projects over the last six years as an acoustical consultant (engineer, whatever you want to call it) -- including many well known buildings/venues.

Mind listing your qualifications?

 

I've been in audio for a long time and like to think I know what I'm talking about but I'll be the first to bow to someone who has a degree in such things as rynberg does.

Long story short a speaker transfers energy to air which generates sound. Ideally you want only the diaphram of the speaker to move and generate sound. This means that whatever the basket of the speaker is mounted to should be infinitely rigid. This guarantees that the enclosure is not contributing sound; only the speaker diaphram. Anything that contributes energy to the air other than the diaphram will have a negative impact on detail and clarity.

The entire speaker industry is founded on building rigid enclosures for the drivers. Anybody who claims it best for "The box has some flex in it to allow for the base and air flow to move more freelyand you get a better echo of the base" is completely delusional and wrong.

If I wasn't so saddened to see someone posting such rubbish I would be laughing, but it's so darn sad I can't laugh

 

That statement has some truth to it!

 

You have no idea what you're talking about. At all. If you had any idea what you were talking about you would not even use such phrases as "small amount of flex is so that the subs have time to catch up with the air flow". Speakers do not generate "flow" or "velocity". They generate pressure.

In that case we can only hope that you will never get time because if you do try you'll still be wrong.

Most guys who do much of this would also know how to spell "enclosed".

What alignment are you planning to use for this super duper box?

 

Yeah, I guess all the speaker manufacturer's should not be producing speakers since they usually use wood, right? And wood isn't as good as fiberglass or carbon fiber, right?

Wood has much better acoustical properties, fibers just have stiffness and can be formed.

Blake

 

KNOWLEDGABLE first-hand experience is always better than just a college degree. I definitely respect your practical knowledge of audio.

I feel the same way.

 

Ok all you guys are FUCKED IN THE HEAD
I was mearily stating that you can use carbonfiber and fiberglass for sub-box and also how do you think a sub-box creates pressure??
It's from air flow why the **** do you think you put air ports in a box look at any ******* sub-box and you will see.
And to begin with I can bet you know **** all about the proporties of carbonfiber or fiberglass.
An also this forum is not long enough for me to go into all my degree's and skills.
So ban me or do what ever you like I dont give a ****.
All I was trying to do was give some info on carbonfiber.

 

ok...

Agreed.

If you insist you need "airflow" then how in fact does an inifinite baffle enclosure work?


I'm not exactly sure how much "**** all" is. Don't have an opinion on that one.


You must have MANY in that case. We bow to you.



You won't be banned, just warned that your language is inappropriate. You are welcome to disagree with me or anyone else but you can't use that language while doing so. Thread locked.

If you would like to actually learn something buy a copy of Vance Dickason's Loudspeaker Cookbook. You can buy it at amazon.com. You can even quote it verbatim to ensure you have your facts straight. Happy Listening.

 

EKTwin93, sorry for closing your thread. If you would like it reopened PM me and I'll just edit it.

 

You learn something new everyday. I'll use that sometime! I've always literally measured and done all the geometry to figure it out. This is easier and more accurate!