sub woofer question

[Sonar]

<font color='#000000'>can somone please tell me why some sub woofeers are designed like the one on this link. http://members.aol.com/ettaylor/subwoofer.htm
(you may need to use copy paist in order for this to work)
*On the inside as you can see there are thos two seperated sections. *What exacly do they do?
thanks</font>

[Clint DeBoer]

<font color='#000000'>The writer of the article states that they are merely internal bracing. I suspect he made each unique in order to combat any standing waves, or perhaps for reasons of breaking up airflow.</font>

[Sonar]

<font color='#000000'>So then these are not realy needed when Designing a sub woofer right? or would it be better to have them?

thanks</font>

[Clint DeBoer]

<font color='#008080'>You NEED bracing as you want to eliminate cabinet vibrations. The only thing you want to move or vibrate is the speaker. And you cannot simply put a solid piece of wood across the cabinet as you effectively cut the cabinet in half... So you design bracing to allow air flow.</font>

[Sonar]

<font color='#000000'>Ok I got it now.

thanks alot for your help. &nbsp;<img src="http://www.audioholics.com/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'></font>