6" port layout. - AVS Forum
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post #1 of 22 Old 01-12-2007, 07:12 AM - Thread Starter
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According to Winisd, I can get a 17.9hz tune with a 6" port at 24". The proposed box is 25" cubed, 9cuft. How much room does the port need to vent easily before reaching the rear panel? Or is there another suggestion based on the 25" cube?

Thanks

UPDATE: Go to post 19.

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post #2 of 22 Old 01-12-2007, 08:49 AM
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6" port should be 6" away from the interior walls of the box. That's pretty much impossible with your design.

Low tuned 2' cubes use PR's
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post #3 of 22 Old 01-12-2007, 10:15 AM - Thread Starter
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So I guess I'd have to go with 4" port at 16" tuned to 14hz. Would that work?

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post #4 of 22 Old 01-12-2007, 10:36 AM
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It will be fine for a modest excrusion 12" driver.
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post #5 of 22 Old 01-12-2007, 10:41 AM - Thread Starter
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It's a SS Rpl 15" D4.

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post #6 of 22 Old 01-12-2007, 10:45 AM
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Then your options are....

1) different shaped box so you can use a 6" port
2) use PR's
3) go sealed
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post #7 of 22 Old 01-12-2007, 10:50 AM
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With 8" of play in port length between the Fb's of 18 Hz and 14 Hz, you should be able to make that port length anything that fits well in between 16" and 21". Keep the end of the port away from the wall or acoustic panel (if used) by at least 5". This space at the end will allow for proper end correction of the acoustical port.
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post #8 of 22 Old 01-12-2007, 11:07 AM - Thread Starter
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Quote:
Originally Posted by stevdart View Post

With 8" of play in port length between the Fb's of 18 Hz and 14 Hz, you should be able to make that port length anything that fits well in between 16" and 21". Keep the end of the port away from the wall or acoustic panel (if used) by at least 5". This space at the end will allow for proper end correction of the acoustical port.

So a 4" port at, let's say 20" is fine?

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post #9 of 22 Old 01-12-2007, 11:37 AM
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Or just have the port stick out like a periscope.
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post #10 of 22 Old 01-12-2007, 01:16 PM
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Quote:
Originally Posted by vitod View Post

So a 4" port at, let's say 20" is fine?

That driver needs a 6" port.
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post #11 of 22 Old 01-12-2007, 04:04 PM
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You'll probably get port noise, depending on the size of the amp, if you use the 4"
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post #12 of 22 Old 01-12-2007, 09:03 PM
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Vitod, you meant to say 6" diameter, correct? If so, then yes, according to what you have written here.
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post #13 of 22 Old 01-13-2007, 08:05 AM - Thread Starter
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Quote:
Originally Posted by brandonnash View Post

You'll probably get port noise, depending on the size of the amp, if you use the 4"

The amp is a EP2500.

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post #14 of 22 Old 01-13-2007, 08:05 AM - Thread Starter
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Quote:
Originally Posted by stevdart View Post

Vitod, you meant to say 6" diameter, correct? If so, then yes, according to what you have written here.

Yes 6" diameter.

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post #15 of 22 Old 01-13-2007, 07:52 PM
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What about a slot port?
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post #16 of 22 Old 01-14-2007, 07:43 AM - Thread Starter
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Quote:
Originally Posted by derekbannatyne View Post

What about a slot port?

Can't do it. Round port is way easier.

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post #17 of 22 Old 01-14-2007, 09:49 AM
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How about multiple smaller ports?

Look at the new SVS Ultra13. 22x21.5x27 using 3 3.5" ports. Then you can experiment with tunings and even sealed. I believe they use elbows inside the box.

This design is screaming to be cloned by the DIY crowd if a decent third party driver can be used.

Sorry Ron & Tom, better get those Ultra to market soon!


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post #18 of 22 Old 01-14-2007, 11:07 AM - Thread Starter
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Quote:
Originally Posted by Vinculum View Post

How about multiple smaller ports?

Look at the new SVS Ultra13. 22x21.5x27 using 3 3.5" ports. Then you can experiment with tunings and even sealed. I believe they use elbows inside the box.

This design is screaming to be cloned by the DIY crowd if a decent third party driver can be used.

Sorry Ron & Tom, better get those Ultra to market soon!


Dr V

That's very interesting. I'd have tuning options.

Maybe someone can add to this.

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post #19 of 22 Old 01-15-2007, 08:53 AM - Thread Starter
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According to Winisd, I can have a 4" port at 15.2" and get 14.3 tune. (net) If I go with 6"x 23", I get 17.4hz tune. (net) I think with the 6", I'll get more SPL.
I have to work with 9cuft, 25" internal cube. (net) In the real world, would port noise be an issue or it won't be as noticeable? What do you people suggest?

I'm using a SS Rpl 15" D4.

Thanks

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post #20 of 22 Old 01-16-2007, 05:50 AM - Thread Starter
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Anybody?

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post #21 of 22 Old 01-16-2007, 06:31 AM
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In the real world port noise would certainly be noticeable with the 4". Most definitely go with the 6"....
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post #22 of 22 Old 01-16-2007, 08:33 AM - Thread Starter
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Thanks willd!

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