one port of two smaller ports?
Printed From: the12volt.com
Forum Name: Fiberglass, Fabrication, and Interiors
Forum Discription: Fiberglass Kick Panels, Subwoofer Enclosures, Plexiglas, Fabrics, Materials, Finishes, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=75873
Printed Date: June 03, 2024 at 7:07 AM
Topic: one port of two smaller ports?
Posted By: phadrus_608
Subject: one port of two smaller ports?
Date Posted: April 07, 2006 at 11:07 PM
New to the forum, and was hoping to get some insite into this idea. I have a box being built for a 99 Taurus Station wagon.. it's for a single 12 inch MTX. The box is 2 cubic feet internal volume with about a 15 inch deep shelf port.... now the question I have.. is can I separate that one shelf port into two. The opening measures 2 inches by 14 inches.. so what if I made two 2 inch by 7 inch? Possibly too small an opening.. is there a calculation for possible port whisper? Any info and suggestions would be appriciated.
Replies:
Posted By: doibuy
Date Posted: April 08, 2006 at 12:40 PM
What are you trying to acomplish by having two ports instead of one?
Posted By: phadrus_608
Date Posted: April 08, 2006 at 1:10 PM
sorry bout that guys.. I thought it would copy paste over.. ok.. well I'm just trying to create a symetrical look with the box front. I could just make a fake port or something, but I just figured I'd ask to see if anyone knew if splitting it would cause negative effects.
Posted By: stevdart
Date Posted: April 11, 2006 at 10:37 PM
If you change one port to two ports the sizes will change. It's not a matter of volume, as in you can't figure the volume of your port and cut it in half for two ports. If you change your present port to make two and kept all else the same including port opening area, you would have to increase the length of BOTH ports by over double the length of the original one. And if you decrease the opening area of the port, the length will grow. Here are some calculating tools for you to use: ------------- Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: phadrus_608
Date Posted: April 12, 2006 at 11:38 PM
thankyou very much stevdart. those pages are coming in very handy :)
Posted By: stevdart
Date Posted: April 13, 2006 at 12:01 AM
Post up how things turn out. You sound as if you would be a good candidate to take the step to a box-building program. I have a stickied topic in the Car Audio forum on using WinISD that would clear things up a lot for you...and take care of some of those calculations, too. Of course you have to follow along and download the program. It's not that hard.
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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: stevdart
Date Posted: April 13, 2006 at 7:41 AM
Above, I said, "And if you decrease the opening area of the port, the length will grow." That's not right...it's the opposite. See why I need to use a box modeling program? I get confused. ;)
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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
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