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View Full Version : Does a port have to be on the inside of an enclosure? Can it be run out of the box?



txdog27
11-12-2011, 01:52 AM
I have an odd question to ask...

Does a port on a vented subwoofer enclosure have to be inside the enclosure or can it be run outside of the box as well......

For example to explain what I mean...

Say a 4" diameter by 30" length aeroport was used on an enclosure....
The port is usually mounted to the face and run into the box.....

Is it the equivalent to run just 6" into the box with the other 24" outside of the box?

Now this is not an example of what I am wanting to do....just a general idea to see if it is even possible with the same results.

mylows10
11-12-2011, 01:55 AM
yes it can be done ,but usually works best in hatchbacks

txdog27
11-12-2011, 02:00 AM
how so?

TaylorFade
11-12-2011, 02:03 AM
yes it can be done ,but usually works best in hatchbacks

Lol. Has nothing to do with the vehicle. Externally mounting a port makes it more efficient. To get the most out of your port, they should all be mounted like that. But because of the length and the fact that it looks stupid, it's hardly ever the case.

Tou answer your question specifically, 6" inside and 24" outside is just like 30" inside... but better. Lol. I mount ALL of my SPL ports externally and most of my dailys. IDGAF what it looks like as long as it's loud.

Just a few examples. Lol.

http://i848.photobucket.com/albums/ab45/taylorfade/16ac7700.jpg

http://i848.photobucket.com/albums/ab45/taylorfade/57aac5c8.jpg

http://i848.photobucket.com/albums/ab45/taylorfade/f6a14a69.jpg

http://i848.photobucket.com/albums/ab45/taylorfade/a97f131a.jpg

http://i848.photobucket.com/albums/ab45/taylorfade/5dcad935.jpg

http://i848.photobucket.com/albums/ab45/taylorfade/69820453.jpg

txdog27
11-12-2011, 02:11 AM
**** taylor.....that last pic with the 8 American Bass subs is sick.....how did you make that port on that one and how did you mount it to the box?

Also good to know that this is possible and actually better....learn something new everyday lol.....plus opens up whole new design possibilities for me now....

Thanks for the info bud

mylows10
11-12-2011, 02:12 AM
heres some pics of my friends crx Competitor Stats: Team SSC - Dan (http://www.termpro.com/asp/competitorstats.asp?Competitor_ID=67677&Season=2011) you can see the ports coming out the back of the box

txdog27
11-12-2011, 02:18 AM
heres some pics of my friends crx Competitor Stats: Team SSC - Dan (http://www.termpro.com/asp/competitorstats.asp?Competitor_ID=67677&Season=2011) you can see the ports coming out the back of the box

Lol...there team name should be IBCC instead......"Itty Bitty Car Committee"..............lmao I'm just jokin around man....those are some nice setups....looks like they do well at comp...

mylows10
11-12-2011, 02:21 AM
from 153.8 -157 from 4 different crx cars

TaylorFade
11-12-2011, 02:23 AM
**** taylor.....that last pic with the 8 American Bass subs is sick.....how did you make that port on that one and how did you mount it to the box?

Also good to know that this is possible and actually better....learn something new everyday lol.....plus opens up whole new design possibilities for me now....

Thanks for the info bud

The PVC flares you see were done by making a form for whatever size port we were making. Then we heated a big *** pot of cooking oil to 350*. Soak the PVC in that oil for a minute or so and it gets pretty buttery. Push it down onto that form and voila, instant aero. Well, after it cools, of course. It's messy business, but makes some pretty sweet ports.

On that port (it's an 8"), I made one side flared, but pushed down on it a little further to flatten it out essentially making it a mounting flare.

Should be noted that I rarely mount the actual flare to the box. Normally, I make the cutout juuuuust big enough to beat the tube into and then mount the flares on either side. This makes manipulating tuning and/or impedance rise easier because you can just slide it in and out and test how much in and out is the best combo.

txdog27
11-12-2011, 02:30 AM
Good info....thank you very much

Nut Hair Trick
11-12-2011, 02:32 AM
But because of the length and the fact that it looks stupid, it's hardly ever the case.
I'm sorry, you are 100% correct. It does look stupid lol. I would never have a huge bagpipe looking thing in my trunk. But for those that do have them and are happy with them, that is all that matters.

txdog27
11-12-2011, 02:34 AM
I'm sorry, you are 100% correct. It does look stupid lol. I would never have a huge bagpipe looking thing in my trunk. But for those that do have them and are happy with them, that is all that matters.

What sub is that in your sig??

Nut Hair Trick
11-12-2011, 02:35 AM
Death Penalty 12

txdog27
11-12-2011, 02:49 AM
Death Penalty 12

Is that the original motor structure? Looks different than the ones I have seen.....

Nut Hair Trick
11-12-2011, 02:53 AM
It's the 2011 model. Before I pulled the trigger and bought it, I never once saw the first picture of one on the internet. The only picture I ever saw was the stock photo which was really small. Here's my thread with more photos in it:
http://www.caraudio.com/forums/subwoofers/526295-new-ia-death-penalty-12-a.html

txdog27
11-12-2011, 03:00 AM
AHHH.....**** thats a nice looking rear end lol

whats the xmax on those babies?

Nut Hair Trick
11-12-2011, 03:01 AM
xmax is 28

kushy_dreams
11-12-2011, 06:40 PM
I'll use this thread an excuse to ***** out my setup, the external aeros work pretty well in trunk cars too.

http://carphotos.cardomain.com/ride_images/3/109/1749/25270874038_large.jpg

bgowdy31
12-06-2011, 01:32 PM
The PVC flares you see were done by making a form for whatever size port we were making. Then we heated a big *** pot of cooking oil to 350*. Soak the PVC in that oil for a minute or so and it gets pretty buttery. Push it down onto that form and voila, instant aero. Well, after it cools, of course. It's messy business, but makes some pretty sweet ports.

On that port (it's an 8"), I made one side flared, but pushed down on it a little further to flatten it out essentially making it a mounting flare.

Should be noted that I rarely mount the actual flare to the box. Normally, I make the cutout juuuuust big enough to beat the tube into and then mount the flares on either side. This makes manipulating tuning and/or impedance rise easier because you can just slide it in and out and test how much in and out is the best combo.

lmfao....... does this really work? its actually genius

KyleBechtold
12-06-2011, 01:59 PM
since no one said it completely yes.. the benefits of the port being out is you don't have to make the box bigger to incorporate its displacement and in some instances if you can't reach the tuning due to the port needing to be bigger than the box.. SA-8s are an example in that case.. the benefits of it being in is that its not terrible to look at..

mast240
12-06-2011, 03:04 PM
Also, it should be mentioned that porting outside the box will slightly change the tuning, if the original plans called for the port to be internal (i.e. a box designed for an internal aero, and then having the aero moved to the outside)