Help with polyfil?

[ThatChevyGuy 5,000+ posts]

Im going to be building a 10 cube sealed box for 4 18" ma audio 181xq

The rec'd specs are 2.5 cubes per sub, so that matches up ok, but how much polyfil would i need to add to make the low end extension greater? Alot? Thread on polyfil?

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[9BlackN*Black6 10+ year member]

1-1.5 lbs polyfil/ cu ft

I just bought 3 lbs for my 3.25, Its going in this weekend.

 

[grooverider 10+ year member]

how much difference does it do?

 

[Cabin_Pressure 10+ year member]

1-1.5 lbs polyfil/ cu ftI just bought 3 lbs for my 3.25, Its going in this weekend.

Thats about what i use. Usually 1 bag per cu. ft..

 

[9BlackN*Black6 10+ year member]

how much difference does it do?

Ive never tried it, as this is my first big system. Im gonna try it out on my solo x. I got a pretty good ear on how it sounds now, Ill let ya know this weekend, I read that smaller enclosures benefit more from polyfil, makes the sub think its in a bigger box. But we'll see...

 

[Cabin_Pressure 10+ year member]

how much difference does it do?

I've gained a noticeable lowend extension by using the 1lb./1cu.ft method. It also eliminated frequency peaks in the enclosure.