polyfill

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mindctrl

Copper - Posts: 114

Joined: October 29, 2003

Location: United States

Posted: January 02, 2004 at 9:55 PM / IP Logged

Hi again,

I have 2 12" Infinity Reference subs, and I'm going with the ported enclosure built to the dimensions that Infinity specifies. It asks for one-inch polyfill lining on all walls except the one with the subs... Anyways, I was wondering where I can get this lining, how much I should expect to pay for it, and whether or not it's really worth it? All opinions and suggestions welcome! Thanks guys.

--mindctrl

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Joined: November 01, 2003

Location: Alberta, Canada

Posted: January 02, 2004 at 9:59 PM / IP Logged

Polyfil is a pillow stuffing material, so find the other halfs favorite pillow and go to town. It is available at a lot of fabric stores, also known as Dacron. If you want to try another product that works really good, pm me and I'll send you some info.

Top Secret, I can tell you but then my wife will kill me.

dyer

Copper - Posts: 206

Joined: May 24, 2002

Location: United States

Posted: January 02, 2004 at 11:30 PM / IP Logged

you can get polyfill at walmart for under 5 bucks.

Dyer

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: January 02, 2004 at 11:43 PM / IP Logged

The Dacron pillow stuffing (or quilt batting) found in fabric stores will do the job, although it is not very dense and can be hard to work with. If you want professional polyfill designed for audio applications, try a product called "Acousta Stuff" that I personally use.

tuneman

Member - Posts: 43

Joined: November 23, 2003

Location: Washington, United States

Posted: January 03, 2004 at 2:23 AM / IP Logged

Old school guys used to use fiberglass, but I would only suggest this in a sealed enclosure.

DYohn

Moderator - Posts: 10,741

Joined: April 22, 2003

Location: Arizona, United States

Posted: January 03, 2004 at 9:52 AM / IP Logged

I suggest you NEVER use fiberglass, if what you mean is the sort of fiberglass used as house insulation. This stuff will shed fibers which can get caught in your drivers between the voice coil and the magnet assembly and can FRY your speakers. Don't use it.

I am, by the way, an "old school" guy! polyfill -- posted image.

Haldol

Copper - Posts: 65

Joined: December 10, 2003

Location: United States

Posted: January 03, 2004 at 10:18 AM / IP Logged

I once read in an 1995 issue of Auto Sound and Security that it a general rule of thumb is that you should use 1.5 pounds (18oz) of polyfill per cubic foot. Where I worked in the past, we used a fraction of that amount. I have tried it both ways and in fact, used the 18oz rule many many times with no noticeable bad effects. Anyone else with an opinion?

DYohn

Moderator - Posts: 10,741

Joined: April 22, 2003

Location: Arizona, United States

Posted: January 03, 2004 at 11:17 AM / IP Logged

1 lb of good quality polyfill adds about 10% to the apparent volume of an enclosure. So a 1 cuft sealed enclosure with 1 lb polyfill acts like 1.1 cuft of air space. I have always used 1 lb per 1 cuft as my standard, but some people (and some loudspeaker manufacturers) recomend different standards. It all depends on what you're trying to accomplish.

Alpine Guy

Platinum - Posts: 2,478

Joined: October 18, 2003

Location: Canada

Posted: January 03, 2004 at 6:29 PM / IP Logged

1 pound of that stuff wont even fit into a 1cube enclosure, it would be super packed and the sub wouldn't breath,,,or is there secrets??

jakita

Copper - Posts: 56

Joined: December 13, 2003

Location: United States

Posted: January 03, 2004 at 10:30 PM / IP Logged

Just throw a little and maybe spray some glue on the side walls for it to stick to. Infinity uses it for the purpose of deadening stray rear waves to improve the sound. If you are using alot of it you are tricking the driver into sounding like it is in a bigger box

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