I am going to build a box for my JL15W0 but I am having a problem finding a port that fits their specs. They call for a 5" diameter x 14" length port. I haven't been able to find one that would work at all.

 

you try home depot yet? PVC works from what i hear.

 

I wouldn't suggest using the pvc as a port, not because how it functions, but that without a flare on each end of the pvc, it will create turbulance around the entry and exit way of the pipe, and also create wind noise, which isn't what you want. Parts express has some really nice ports, check them out at

www.partsexpress.com

 

that has to be the most confusing website ever... can you find a direct link?

 

i would suggest making your own rectangular ports...it will be a more custom look and will sound much better

 

You can flare a PVC port, you just need to be a bit more creative. You can radius the wood that it glues to on the exterior of the box, and likewise, you can glue more wood to the other end and flare it. A great way to do this is to build an internal brace inside the box, and put it right at the end of the port. Cut the right size hole, then grab a router and flare away. Not only does this keep costs down (even 4" flared ports are UBER expensive), but it adds a nice brace inside the box to keep resonances down.

 

can someone show a pic? im not sure what you mean by a flared port.

 

I would like to see what a wooden flared port looks like.

 

Yeah I never tried that with wood before but sounds like it could have a good end result when finished. A flared port is like a rounded port, that smoothens out airflow and increases the airs velocity at the edges. By doing this it makes the port more efficient and can boost dbs in many cases, but most of all it all but eliminates port noise, which sucks! I tried to get a link from parts express when I wrote this, but there site was done, internal server error.

 

Heres a flared port from lightning audio, available from crutchfield.

 

flared ports eliminate port noise....but my vote still goes with rectangular ports if you want better results

 

It looks like a big piece of wood that's had the edge beveled with a router.

Here's an article that shows it:
http://www.speakerbuilder.net/web_fi...ut/porttut.htm

The only thing that article doesn't show is that you can do the same thing on the back side of the port with the internal brace.

 

do those ports run very expensive? whats the best place to buy

 

http://www.partsexpress.com/webpage....ctGroup_ID=143

Check that out!

 

im lookin for a 3x8 port. can somebody help me find one.

 

how do you make a square port, i know if i had a round port it has to be 3 inches wide and 8 inches long for my specific use, how would i make it into a square port, i could use the left over wood ill have, but how do i make the squre port area = the round port area, will i have to do my math hw from high school again?

 

nono making a square port isnt really that complicated unless you want it to be.


http://www.carstereo.com/help/Articles.cfm?id=31 if you go here and go to the second calculator "calculate vent length" if you put in your box specs, desired tuning frequency, and the outside dimensions of the port you would like to use it will calculate the length for you

dont forget to click on to square ports

 

I'm glad someone said it before I did! My fiancee's cousin just did a box with 4 ports from PE, and they're actually pretty d@mm good!
-G