Where to place the port (part 2) - Page 2 - diyAudio
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Old 4th November 2011, 07:36 PM   #11
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The reason I do not want the ports pointed towards my glass is because I had a similar set up in my car before and it decided to blow my trunk lock right off..and put a crack in my back window. About to pay this dude $150 to make it for me because you're confusing the heck out of me.
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Old 4th November 2011, 07:40 PM   #12
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Quote:
Originally Posted by carshateme View Post
The reason I do not want the ports pointed towards my glass is because I had a similar set up in my car before and it decided to blow my trunk lock right off..and put a crack in my back window. About to pay this dude $150 to make it for me because you're confusing the heck out of me.
I see, you want to port the cabinet for the added low end, then throw the added low end away by having it get lost in the trunk.

Makes perfect sense to me
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Old 4th November 2011, 08:19 PM   #13
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Well I came up with a new design, since you are arguing about low ends..blah blah. lol.

New specs:
Box: 32"w x 13"h x 20"d.
Port: 3" w x 11.5"h x 21.5"d

..although it will one tight fit...I will be trying to put the subs on like most subs are...towards the trunk opening, and putting the Slot port in the center with a short divider going about 6" from the wall in the center of the port. Will have a sketch done when I get out of work..

Question can I have a 3" gap between cut around.
Ex. my depth is 20 inch...cut off 1.5in for the walls, gives you 18.5in to play with...so use 15.5in and stop, go over 3 inches from that wall and then 6 in from there.
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Old 4th November 2011, 10:14 PM   #14
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Quote:
Originally Posted by carshateme View Post
Well I came up with a new design, since you are arguing about low ends..blah blah. lol.

New specs:
Box: 32"w x 13"h x 20"d.
Port: 3" w x 11.5"h x 21.5"d

..although it will one tight fit...I will be trying to put the subs on like most subs are...towards the trunk opening, and putting the Slot port in the center with a short divider going about 6" from the wall in the center of the port. Will have a sketch done when I get out of work..

Question can I have a 3" gap between cut around.
Ex. my depth is 20 inch...cut off 1.5in for the walls, gives you 18.5in to play with...so use 15.5in and stop, go over 3 inches from that wall and then 6 in from there.
An "L" shaped port will work OK, round the corner. Good idea to round the outside corners too, to avoid chuffing noise.
The extra resistance of the "L" bend will probably tune a little lower than a straight port.
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Old 4th November 2011, 11:07 PM   #15
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Alright I got the pictures now.. I want to know your opinion on this one...it was one of my a design for my audiobahn subs...and I'm using L bend as you recommended.

The lines in the center represent the sub and how far it will go in. Now I have already calculated everything carefully...after subtracting the port volume from the box volume and subtracting the sub displacement, I got a box with 3.01 Cu ft volume, which is perfect. The volume recommended for these subs is 1.5. I don't know about the center piece b/w the port...but a guy name barron on here recommended it a while ago. I used it on my audiobahn box, and it works great.

The extra face plate is just insurance that my box won't blow apart...and I don't know think I'll be able to screw the sub in the first layer with out splitting the upper wood. So thus the face plate will be used.

X-ray:

Click the image to open in full size.

Normal:

Click the image to open in full size.

Front view:

Click the image to open in full size.
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Last edited by carshateme; 4th November 2011 at 11:15 PM.
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Old 5th November 2011, 01:46 AM   #16
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I also made another model with the subs upward...pretty much the same specs and such, I favor the first one I made though instead of this...but if it's better, I'd use this one.
Unlike the first one, the ports are 2" x 18.5" x 21" with a 4" bracket in the middle...thought I don't think that bracket is a smart idea for such a small width port.

X-ray:

Click the image to open in full size.

Normal:

Click the image to open in full size.
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Old 5th November 2011, 02:02 AM   #17
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Quote:
Originally Posted by carshateme View Post
Ah thank you for the picture, I didn't know what he was talking about...now I gotta go look for a triangular port calculator.
Calculate the area of a rectangular port using the triangle port "leg" dimensions. Divide by 2. Divide the answer by "pi". Take the square root of the answer. That gives the equivalent round port radius. Multiply by 2 to give you the equivalent round port diameter. You can also calculate this backwards if needed.
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Old 5th November 2011, 02:10 AM   #18
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Quote:
Originally Posted by scitizen17 View Post
Calculate the area of a rectangular port using the triangle port "leg" dimensions. Divide by 2. Divide the answer by "pi". Take the square root of the answer. That gives the equivalent round port radius. Multiply by 2 to give you the equivalent round port diameter. You can also calculate this backwards if needed.
Too much work...for a lazy person lol.

Sticking with the slot port.
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