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Old 07-16-2009, 10:13 PM
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Default Calculating port length for a port with changing area?

Can anyone explain how to calculate the port length for a port with an expanding port area? Here's what I'm working on now:



The port is 10.5" tall, whereas the internal box height is 15.5". The enclosure is looking to be 2 separate enclosures, 1 for each 10, with separate ports too. I'm trying to get tuning down to ~32-33hz, but I need a really long port for that which is going to mean I need some way to "blend" the height of the port to the height of the box... Any ideas on how to help? Right now the port is 2.88"w x 10.5"h.

If anyone has any other designs, feel free to let me know. I have 2 10's that need ~1.25 cubic feet each, tuned low (like I said 32-33hz). I was trying to port through the ski-pass in the middle of my backseat, it's 6.5"w x 10.5"h. I also have 2 6x9 holes that I can get 4" aero ports through, but I can only get ~19.25" of length out of the aeros without bending them. Max dimensions are 17"h x 32"w x ??"d. I'm trying to minimize the depth since I like to be able to get my spare tire out. Max depth that I can still get my tire out is ~18".

The goal is a low tuned daily box that will still get loud. Someone help me... Thanks guys
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Old 07-16-2009, 10:15 PM
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I have no idea how to do that I would just make the port 1 height and leave the space under the port open for more air space
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Old 07-16-2009, 10:21 PM
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Quote:
Originally Posted by wenn_du_weinst View Post
I have no idea how to do that I would just make the port 1 height and leave the space under the port open for more air space
But wouldn't doing that hinder the airflow into the port?
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Old 07-16-2009, 10:29 PM
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possibly you could block it off but I wouldn't do a tapered port like that
I guess now that I think about it it would act the opposite way of a horn?
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Old 07-16-2009, 10:37 PM
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No. It's just smoothing the flow of air into the port. It would be like a little ramp up from the bottom of the box to the level of the bottom of the port. Same thing on the top of the enclosure...
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Old 07-16-2009, 10:39 PM
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are you talking the actual port or things before the port if it's in the port it will act like a tapered line but backwards
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Old 07-16-2009, 10:40 PM
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Hold on, let me take the trash out, and I'll model up what I'm talking about... Then I'll take another screen shot and post it so you can see what I mean...
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Old 07-16-2009, 10:58 PM
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Here's kind of what I have in mind. This is only 1-d, but it would more than likely slope down in multiple directions. I hope you get the general idea from this:

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Old 07-16-2009, 11:00 PM
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if it isn't in the actual port it will change tuning so slightly you won't really hear it
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Old 07-16-2009, 11:06 PM
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So you're saying it won't change anything port length wise? I just need to account for the volume of the slopes?
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