Ported sub: Fill with poylfil or no??

[drpeeb 10+ year member]

Anybody know?

My Kicker KM10 manual gives enclosure and port size formulas, tips, etc. but doesn't mention whether or not to fill the ported enclosures.

Maybe that's because I shouldn't do it??

Click to read more...

 

[SicAudio 5,000+ posts]

generally you dont use polyfill in a ported box but if you are short on volume of the box as long as you attach the polyfill it is ok.

 

[drpeeb 10+ year member]

generally you dont use polyfill in a ported box but if you are short on volume of the box as long as you attach the polyfill it is ok.

Using my brain again, I realize polyfil would blow out the port. Momentary lapse ... I hope.

 

[James Bang 5,000+ posts]

I don't think polyfill is good for airflow. If it is i'd put some in my air filter.

 

[gotparts90 10+ year member]

there was a good site for it somewhere that had the charts on how much to use and it did work if your box was on the small side to make it seem bigger even in a ported box but without the chart I would be lost on how to fiquire it out. I though it was on collisons site from down under but I could not find it when I looked for it last.If someone finds it post a linky I needed it a few weeks ago.

 

[Toone 10+ year member]

1 bag per cube

 

[gotparts90 10+ year member]

1 bag per cube

what if it's a 50 pound bag?

1 pound per cube was general for sealed but there was a nice chart that showed percentage of enclosure increase per pound in a given volume that I can't find.

 

[Kil4Thril 10+ year member]

http://www.audiojunkies.com/blog/1348/ultimate-polyfill-subwoofer-enclosure-resource

Polyfill can be very effective in small ported boxes (think SoundSplinter drivers or Sundown e8) where the port length makes it very tough to build, or where you're trying to retrofit and a passive radiator won't fit.

 

[gotparts90 10+ year member]

http://www.audiojunkies.com/blog/1348/ultimate-polyfill-subwoofer-enclosure-resource
Polyfill can be very effective in small ported boxes (think SoundSplinter drivers or Sundown e8) where the port length makes it very tough to build, or where you're trying to retrofit and a passive radiator won't fit.

thanks i needed that a few weeks ago and could not find it.

 

[madmaxz 10+ year member]

Polyfill worked great in my box that was alittle small for The re sr10's which call for 1 cube each ported and my box was .75 so i did .5lb per side and it sounds way better with the poly. alot less port noise and still moves alot of air. and yes i glued it to the box and its not blocking the port.

 

[subzero 5,000+ posts]

The manufacture spec for my subs call for polly fil and resin. Says apply resin coat inner box, apply polly fill. ported or sealed. So on my next box I am doing it exactly like they say. Max ouput box.

 

[drpeeb 10+ year member]

Polyfill worked great in my box that was alittle small for The re sr10's which call for 1 cube each ported and my box was .75 so i did .5lb per side and it sounds way better with the poly. alot less port noise and still moves alot of air. and yes i glued it to the box and its not blocking the port.

Ahhh ... not blocking the port, and gluing it in place. I like those ideas.

That would be very similar to common home stereo speakers ... especially ones with a passive radiator or a port. They attach polyfil or deadener of some kind to the interior walls of the speaker enclosure but don't block the port or radiator.

 

[jusBloud 10+ year member]

do you loose any dbs in a ported box?

 

[subzero 5,000+ posts]

Yup but you need to consider this.... most like the bass reflex (no fiber filled in ported box I think) sound to get that extra boomy touch. I believe. could be wrong. My old JBL 4312 control monitors had a fiber lined on ever inner wall and the port curve aimed at the back of the cone the pick up the back waves. This thing sounded better than any other speaker I have ever heard. It hit hard and clean , got low. but wasnt boomy.

 

[drpeeb 10+ year member]

Yup but you need to consider this.... most like the bass reflex (no fiber filled in ported box I think) sound to get that extra boomy touch. I believe. could be wrong. My old JBL 4312 control monitors had a fiber lined on ever inner wall and the port curve aimed at the back of the cone the pick up the back waves. This thing sounded better than any other speaker I have ever heard. It hit hard and clean , got low. but wasnt boomy.

I have a pair of old circa 1980 Radio Shack Realistic Optimus T-300's (34"H x 12.5"W x 13"D) sitting right in front of me here at work ... 10" woofer and a 10" passive radiator (1" tweet & _"? mid). These are some great sounding speakers! The bass is like vibrant and lively. Unlike the sealed 10" sub in my truck, which does thump pretty good, I don't have to search for a specific song to try to "demonstrate how good these speakers sound", because all songs sound great on them. Sure wish I could transfer this sound to my truck!