post #1 of Old 05-29-2008, 11:39 AM Thread Starter
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1990 YJ Wrangler 
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Location: missouri
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Yj Anybody know anything about 6 1/2" speaker box porting?

I know I already posted it but the other title is misleading and I don't know what I am doing.
Well I built soundpods for my YJ. I will try to get pics later, my camera batteries were dead this morning. I used sony explode 6.5" 3 way speakers, new that I got off craigslist for $15.00. I built the pods rather small, they are only a total of 2.25" deep (about 1.25" inside just enough depth that the magnet does not touch the top of the pod) and about 7" x 9" (the 6.5" speaker grill fits with about 1/2" all around). I made them so small to try to maximize rear head room. I have designed them to fit behind the center bar. They will set in the corner of the center bar and the rear side bar, and are almost flush with the bottom of the bar. I cut them at the same angle the side bar intersects the center bar so they have a nice fit. I made them out of 1/2" sanded plywood that I had lying around, and I used plasticote bedliner on the exterior. Since I have made them so small and there is so little airspace should I port the box? I am very new to the sound scene and am looking for any help I can get. I am not looking for a booming system, just something a little more signifigant than the 2 front speakers I have now (I think they are 4"x6"). I think my setup will be all that I need, I just want to make sure it is set up correctly. I tried them out last night on the floor of the jeep temporarily and noticed that the cone doesn't move much. That is why I am thinking I may need to port it. Thanks for your help.


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post #2 of Old 05-29-2008, 02:19 PM
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Well a port is more than just cutting a hole in the box. You can port it if you want but I don't think it would make much of a difference with such a small enclosure. With that small of a box I'm not sure that you would even be able to port it because, like I said, a port is more than just a hole. You will need something like pvc pipe that will actually go into the box and I don't know if you really have much room.

Generally, smaller boxes are sealed and it's the larger ones that are more often ported. Also a sealed box will provide with a tighter/crisper low frequencies while a ported box will give you deeper and sometimes louder bass.
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post #3 of Old 05-30-2008, 08:54 AM Thread Starter
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Thanks for the input. I will forget the porting. Would you suggest some of the polyfill, or should I just leave it alone?

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post #4 of Old 05-30-2008, 09:41 AM
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Ya, tuning a port for a conventional speaker is more difficult than just for the low sub frequencies. Plus the box may need to be larger and the port a significantly specific size and length for the frequency you're after. I wouldn't do it. Instead seal the box properly and use polyfill to help assure proper dampening and rear-wave control. I also spray the inside of the box with rubberized undercoating to make sure it's sealed and to add texture to the interior which helps destroy the rear wave.

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post #5 of Old 05-30-2008, 10:57 AM
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You want to look for info on aperiodic enclosures; look for articles about venting kick pods and you'll find some more info. However with such a simple speaker it's probably not worth the effort *2 cents*

From a simple web search:
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post #6 of Old 05-30-2008, 01:49 PM Thread Starter
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Thanks for all the help. I add polyfill and forget the port. I'll post some pics soon. Thanks again.

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