Just curious

[crackshut]

I recently got a double10 box from my pardner. When I get Inside had some kind of cotton
Thing inside. So I hooked up my subs 2 American bass xo 10. wow and the bass line real rocking
Loud notes and lows. So just wanted to know what is that cotton Thing inside the box and does it
Make a difference to how the box plays

[crazybalhead]

The "cotton thing" is dacron/ polyfill. It acts as a dampener and makes the box perfomr like a slightly larger box than is actually is.

Google Polyfill or Dacron and enclsure design and see.

It does make THAT much of a difference, the box is probably well built (solid) and the volumes and Q match with your subs to your liking.

[ruffneck_12]

It lowers the tuning a bit too

It good/bad depending on where you put it
on the walls are fine, but right up against the sub kinda bad

[Ted_v2]

I wonder would it have the same effect on a sealed box as a ported

[Aimar]

It is actually used mostly in sealed applications! And it will make the woofer believe that it is in a slightly bigger enclosure.

[3stagevtec]

A lining of dacron in a vented box works great as well.. It can help reduce standing waves inside the enclosure and reduce any unwanted sounds coming from the rear of the driver.

[nervewrecker]

I wonder would it have the same effect on a sealed box as a ported

I got some of each if you need eh.

I see some say its helps smooth out some peaks in the response too.

[Ted_v2]

What you have there?

[roger]

It lowers the tuning a bit too

says who???

[nervewrecker]

It lowers the tuning a bit too

says who???

Maybe he means for a sealed box.

I'm open to correction on that though roger (you will know more about this than me).

[ruffneck_12]

It lowers the tuning a bit too

says who???

says me :v



51hz before stuffing in a 1.25 cuft sealed bocks
49hz after stuffing ( 1 yard of fold up dacron )

Keep in mind I said a bit, not a lot :v

[nervewrecker]

That's freq or impedance there?

[crackshut]

OK thanks for the info the box I'm using is a ported box btw

[Brian Steele]

OK thanks for the info the box I'm using is a ported box btw

It will lower Fb for a ported box as well. It will also damp the output below Fb, which is a good thing. I used stuffing in my car audio vented boxes years ago (when I used vented boxes in my car audio system). They worked VERY well.

[Brian Steele]

It lowers the tuning a bit too

says who???

says me :v



51hz before stuffing in a 1.25 cuft sealed bocks
49hz after stuffing ( 1 yard of fold up dacron )

Keep in mind I said a bit, not a lot :v

It should be possible to drop Fb a bit lower than that too. The usual method of determining the best amount of stuffing to use is to simply keep adding it until Fb stops dropping.

BTW, those ripples in your impedance curve below 120 Hz or so suggest that there may be other issues with that box that need to be addressed.

[ruffneck_12]

Brian this is what I'm using to gather the data, so it's not too accurate
viewtopic.php?f=3&t=488540

I live in a noisy environment as well :/