Poly-fill in boxes?

[tonka 10+ year member]

Is it true that putting poly-fill in sealed sub enclosures will help the sub preform better? If so how much should I put in? And should I put some in my 6x9 enclosures too?

Thanks,

Aaron

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[Louisiana_CRX 5,000+ posts]

I think the ratio is 1lb per cu ft...I'll have to look and double check

 

[tonka 10+ year member]

Thanks. Is it true that it helps though? if so, how much of a difference should I expect?

 

[fasfocus00 5,000+ posts]

there is a lot more to poly fill than just putting it in a box and hoping for better sound. a lot depends on driver enclosure requirement and box displacement. it's not as simple as my sub sounds like pooh let me add poly fill than your sounds sounds awesome.

 

[modskwod 10+ year member]

Here you go.

 

[tonka 10+ year member]

Here you go.

Thanks, that helps alot

 

[SpeedEuphoria 10+ year member]

So speaking of that site which is very informative.

Seems the tuned frequency lowers by ~5hz or so.

I plan on building a box shortly and can only get 3.55 net cubes for 2x Alpine Type R's. Should I poly-fill it and tune the box for 40hz which should net me 35hz?

The design I'm working on will be removable external round ports so it will e easy to change compared to an L port box. Just wondering if anyone had any experience with it.