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Explain Polyfill

 

guest
Unregistered guest
Can someone please explain the theory and effectiveness of using polyfill in a box and how one would go about doing it correctly? Any special conditions that would not allow the use of it? Does it pose a big dif?
 

Gold Member
Username: Glasswolf

NorthWest, Michigan USA

Post Number: 4837
Registered: Dec-03
polyfill essentially slows soundwaves giving the impression that the box is about 10% larger tahn it actaully is to the subs.
It also reduces standing wave reflection which cancels waves and reduces output.

you want to use about 1 pound of polyfill for every cubic foot of box volume in a sealed box.
for vented, use rolled polyfill sheets and staple gun it to the box to line the box with it about 1" thick.
 

Silver Member
Username: Decde

Canada

Post Number: 150
Registered: Sep-04
When u buy a box already built, does it already have polyfill, or expanding foam, or anything that does the above???
 

Gold Member
Username: Glasswolf

NorthWest, Michigan USA

Post Number: 4843
Registered: Dec-03
some have polyfill lining.
most don't
 

Bronze Member
Username: Deathshadow

Post Number: 41
Registered: Oct-04
So should you use polyfill? Can you even notice the difference? hmmm polyfill is what they stuff pillows with... right lol?
 

Gold Member
Username: Glasswolf

NorthWest, Michigan USA

Post Number: 4861
Registered: Dec-03
yes it is.
yes its noticeable. any time you change box volume 10% you'll notice.
worth it is up to you
 

Bronze Member
Username: Followyoursole

Post Number: 34
Registered: Sep-04
can you go over board? Im currently using about 2 and a half pounds in my ported box right now....SOunds better then without, but whats a good amount? If i reduce it to 2 pounds straight will spl improve?
 

Gold Member
Username: Glasswolf

NorthWest, Michigan USA

Post Number: 4884
Registered: Dec-03
rule of thumb is one pount per sq foot of box volume
 

Bronze Member
Username: Deathshadow

Post Number: 52
Registered: Oct-04
just staple an inch layer around the top, bottom, and sides of the box and thats it? Can it damage your subs?
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