Polyfil? Or Not to Polyfil? That is the Q

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MBZ oe

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Joined: December 18, 2003

Posted: August 17, 2004 at 12:14 PM / IP Logged

I will be installing my new subs today and usually I just put a little polyfil in every enclosure. But does it really make much difference? I built my new Sealed enclosure Exactly to spec for subs, so if I add polyfil the I will be reducing the internal volume. Couldn't this be a negative? Or should I just glue a little in there like I usually do?

boom, boom, boom boom....

DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: August 17, 2004 at 1:35 PM / IP Logged

You will not reduce internal volume, you increase it by adding polyfill. If your enclosure is "built to specs" then you probably do not need it - assuming we are talking about a subwoofer enclosure, that is. No need to worry about standing waves in a sub enclosure, reduction of which is the other function of polyfill (in a full-range system.)

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zane9000

Copper - Posts: 69

Joined: August 07, 2004

Location: United States

Posted: August 17, 2004 at 1:47 PM / IP Logged

at the risk for sounding really dumb (which i do quite often so i guess its ok) whats polyfil and how is putting anything into an eclusure going to increase the total volume?

I had Cheetos and wine for dinenr.

promodeepcycle

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Joined: October 17, 2003

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Posted: August 17, 2004 at 2:58 PM / IP Logged

polyfill whats in your cheap ass wal-mart pillows.... and basically your tricking the sub into thinking its in a bigger box ................................. basically...

dont be a pet monkey ..use your dmm

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DYohn

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Posted: August 17, 2004 at 3:52 PM / IP Logged

Not tricking anything, actually. It's physics. By adding lots of area and random channels that the air must pass through, it slows down and flows in many directions instead of all in the same direction. By slowing down the air movement inside the enclosure, it acts as if it was larger than it is (or rather, the air moves like it would in a larger enclosure with no fill.) Using approximately 1lb of good quality polyfill (like the product called "Acoustastuff") per cuft can make the enclosure behave as if it was as much as 40% larger than it is. Standard Dacron polyester pillow filling is not quite as efficient as Acoustastuff and similar products. With standard pillow batting, you can achieve about a 25% to 30% effective increase.

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Jay T

Copper - Posts: 169

Joined: December 02, 2003

Location: Canada

Posted: August 17, 2004 at 8:51 PM / IP Logged

So thats what that stuff is that makes my box / sub sound so good.

I thought maybe it was for the little bass troll that lives in there to take a nap. LOL

auex

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Posted: August 17, 2004 at 9:05 PM / IP Logged

promodeepcycle wrote:

polyfill whats in your cheap ass wal-mart pillows.... and basically your tricking the sub into thinking its in a bigger box ................................. basically...

How do you know I have walmart cheap ass pillows?

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Silver - Posts: 340

Joined: July 30, 2004

Location: Canada

Posted: August 17, 2004 at 10:12 PM / IP Logged

i guess in ideal 'situation', polyfill could be very helpful for small enclosures needing more area inside the box for air to be filled. rather then padding a spec'd box and creating more space than is needed.

dalmyd1

Member - Posts: 27

Joined: February 13, 2004

Location: United States

Posted: August 17, 2004 at 11:18 PM / IP Logged

I actually tried stuffing my box before an SPL contest just for the hell of it...........BIG MISTAKE!!!!!

Was really funny though.....

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Polyfil? Or Not to Polyfil? That is the Q

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