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polyfill in ported box


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04nata 
Copper - Posts: 358
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Posted: January 21, 2012 at 9:18 AM / IP Logged  
Is it recommended to use polyfill in ported boxes? I have never asked the question and I suppose it could be attached to the sides so it won't flow out the port. I just always assumed that you only use it in sealed boxes.
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DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: January 21, 2012 at 2:20 PM / IP Logged  
It can be used in any enclosure.
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04nata 
Copper - Posts: 358
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Posted: January 21, 2012 at 2:51 PM / IP Logged  
I guess I should have asked the next question, will it benefit sound quality or levels using it in a ported box?
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Kenwood KDC-X599 HU
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2-SQ Q4500.1
2-SQ Q90.4
1-Massive DBX4
8-Niche 5.25 mids
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04nata 
Copper - Posts: 358
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Posted: January 22, 2012 at 10:53 AM / IP Logged  
Anybody have any experience with doing this? Would like some input before I move forward .
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Kenwood KDC-X599 HU
2-Sundown X-18D4
2-SQ Q4500.1
2-SQ Q90.4
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8-Niche 5.25 mids
8-Niche Tweeters
4-Skar 8" mid-bass
OhioGen 220a alt
OhioGen 350a alt
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smgreen20 
Member - Posts: 36
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Joined: October 11, 2006
Location: United States
Posted: January 22, 2012 at 10:34 PM / IP Logged  
Yes it will apply to ported boxes too. The changes aren't as dramatic as ion sealed boxes, but it does have its place in ported.
DYohn 
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Location: Arizona, United States
Posted: January 23, 2012 at 9:07 AM / IP Logged  

If you are building a vented enclosure it is much more important to get the size and port size correct than to worry about adding fill.  Just build it correctly and don't worry about fill. 

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04nata 
Copper - Posts: 358
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Posted: January 23, 2012 at 9:12 AM / IP Logged  
DYohn wrote:

If you are building a vented enclosure it is much more important to get the size and port size correct than to worry about adding fill.  Just build it correctly and don't worry about fill. 

No worries, I have the box built and installed already and it sounds great. ( was very concerned that I calculated the ports right), but the thought crossed my mind as I also have 4- 10"s that are sealed, and was just wondering if the polyfill would have an impact on the sound for the ported 15's.

2004 Hyundai Sonata
Kenwood KDC-X599 HU
2-Sundown X-18D4
2-SQ Q4500.1
2-SQ Q90.4
1-Massive DBX4
8-Niche 5.25 mids
8-Niche Tweeters
4-Skar 8" mid-bass
OhioGen 220a alt
OhioGen 350a alt
156.0
jmelton86 
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Posted: January 23, 2012 at 10:28 AM / IP Logged  
I used poly fil in the ported box for my 12.
I started with no fill -net volume was about 2.7 cubic feet tuned to about 34Hz with the 2 4x17" aero ports. As expected, it didn't go low enough for me.
I initially wanted a lower tuning, but the aero ports come in a lenth of 17", so I couldn't really add port lenth.
I was told that with heavy stuffing, poly fil adds about 10% of volume to the enclosure. So, I stuffed the box moderately and brought the volume up to right under 3 cubic feet. With the extra 10% of added "volume" from the poly fil, it lowered the tuning to ~32Hz. I love it now.
I trick I was told is to use pantyhose on the inside ends of the ports to keep the poly fil from being blown out of the enclosure. I was told that, when stretched and taped over the end of the port, the pantyhose acts like speaker grill cloth and doesn't affect air flow.
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04nata 
Copper - Posts: 358
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Joined: April 22, 2008
Posted: January 23, 2012 at 11:51 AM / IP Logged  
That's great information, who'da thunk that adding something into the airspace would actually create MORE airspace, may sound wierd, but "I'm stuffin' mine tonight !!!!!!!!!!!!!!!!!!!"
2004 Hyundai Sonata
Kenwood KDC-X599 HU
2-Sundown X-18D4
2-SQ Q4500.1
2-SQ Q90.4
1-Massive DBX4
8-Niche 5.25 mids
8-Niche Tweeters
4-Skar 8" mid-bass
OhioGen 220a alt
OhioGen 350a alt
156.0
haemphyst 
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Joined: January 19, 2003
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Posted: January 23, 2012 at 2:57 PM / IP Logged  
It doesn't make it larger... If you add something to a volume, it CAN'T be larger afterwards, can it?
It makes it ACOUSTICALLY larger, by extending the acoustic path to the boundaries of the enclosure, as well as absorbing energies injected into the space.
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
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