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 Topic: polyfill in ported box
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04nata
Joined: April 22, 2008
Posts: 308 |
| Posted: January 21, 2012 at 9:18 AM - IP Logged |
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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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93 Excel (walled)
Clarion HU
4-Niche6.5"comps/tweets
4-Niche 15" subs sealed
1-JLAudio JX1000/1D
75amp Alt (no headlight dim)
139db (iphone app)
"If my ears ain't bleedin' TURN IT UP!"
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DYohn
Joined: April 22, 2003
Location:
Arizona,
United States
Posts: 10,114 |
| Posted: January 21, 2012 at 2:20 PM - IP Logged |
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04nata
Joined: April 22, 2008
Posts: 308 |
| Posted: January 21, 2012 at 2:51 PM - IP Logged |
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I guess I should have asked the next question, will it benefit sound quality or levels using it in a ported box?
___________________________________
93 Excel (walled)
Clarion HU
4-Niche6.5"comps/tweets
4-Niche 15" subs sealed
1-JLAudio JX1000/1D
75amp Alt (no headlight dim)
139db (iphone app)
"If my ears ain't bleedin' TURN IT UP!"
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04nata
Joined: April 22, 2008
Posts: 308 |
| Posted: January 22, 2012 at 10:53 AM - IP Logged |
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Anybody have any experience with doing this? Would like some input before I move forward .
___________________________________
93 Excel (walled)
Clarion HU
4-Niche6.5"comps/tweets
4-Niche 15" subs sealed
1-JLAudio JX1000/1D
75amp Alt (no headlight dim)
139db (iphone app)
"If my ears ain't bleedin' TURN IT UP!"
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smgreen20
Joined: October 11, 2006
Location:
United States
Posts: 34 |
| Posted: January 22, 2012 at 10:34 PM - IP Logged |
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| 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. |
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DYohn
Joined: April 22, 2003
Location:
Arizona,
United States
Posts: 10,114 |
| Posted: January 23, 2012 at 9:07 AM - IP Logged |
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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
Joined: April 22, 2008
Posts: 308 |
| Posted: January 23, 2012 at 9:12 AM - IP Logged |
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DYohn wrote:
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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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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.
___________________________________
93 Excel (walled)
Clarion HU
4-Niche6.5"comps/tweets
4-Niche 15" subs sealed
1-JLAudio JX1000/1D
75amp Alt (no headlight dim)
139db (iphone app)
"If my ears ain't bleedin' TURN IT UP!"
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jmelton86
Joined: February 07, 2007
Location:
South Carolina,
United States
Posts: 1,230 |
| Posted: January 23, 2012 at 10:28 AM - IP Logged |
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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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5 driver, 3 way active setup w/ time delay on each driver.
CDA-9855 PDX4.100 GTO14001
70a alt. Orbital yellow top. Big3 in 4g. 150a fusing.
KeepItSimpleStupid |
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04nata
Joined: April 22, 2008
Posts: 308 |
| Posted: January 23, 2012 at 11:51 AM - IP Logged |
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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 !!!!!!!!!!!!!!!!!!!"
___________________________________
93 Excel (walled)
Clarion HU
4-Niche6.5"comps/tweets
4-Niche 15" subs sealed
1-JLAudio JX1000/1D
75amp Alt (no headlight dim)
139db (iphone app)
"If my ears ain't bleedin' TURN IT UP!"
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haemphyst
Joined: January 19, 2003
Location:
Bouvet Island
Posts: 4,983 |
| Posted: January 23, 2012 at 2:57 PM - IP Logged |
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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.
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That... was... (faints from epicness) |
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