ok, ok, box designing it is.

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whiterob

Copper - Posts: 351

Joined: July 22, 2007

Location: United States

Posted: July 17, 2009 at 2:34 PM / IP Logged

methos123 wrote:

Whiterob, I used the calculator on this website to model the the length of the port. It is right above the calculator for modeling the inside volume of the box. I did it on WinISD a minute ago and it says to go 22" long for a 30hz tuning. What do you all make of this? Which length should I go for here?

What are you putting in the calculator? I used the calculator on this site and got about 31.5" length to get 30Hz tuning.

What I am using is a port width of 2 inches, a height of 13.5 inches, a volume of 2.26 cubic foot and tuning of 30Hz.

methos123

Member - Posts: 42

Joined: July 08, 2009

Location: Arkansas, United States

Posted: July 17, 2009 at 2:42 PM / IP Logged

I used the volume of 2.85. I am trying to upload a pic of the front piece of my port that cracked ever so slightly when screwing a screw in. It is worrying me for long term. I figured that if I already knew what the volume was going to take up, then I wouldn't even need to use the calculator to find out how long it was supposed to be, so I plugged the 2.85 cu ft. figure in their.

I tried to upload a pic and it said it was 2904 kb too much.

methos123

Member - Posts: 42

Joined: July 08, 2009

Location: Arkansas, United States

Posted: July 17, 2009 at 2:51 PM / IP Logged

Well I won't be upoading any pics because it will only let me upload pics of 60kb! I can't get that low. ):

methos123

Member - Posts: 42

Joined: July 08, 2009

Location: Arkansas, United States

Posted: July 17, 2009 at 2:55 PM / IP Logged

Sorry for the double post, but I didn't silicone the corner of the box that is essentially part of the port now, and I can't silicone that corner of the box on the inside. I put Elmer's wood glue on both surfaces before I clamped and screwed them though. Will silicone on the outside be good for that area?

Thanks

stevdart

Platinum - Posts: 5,816

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Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: July 17, 2009 at 3:45 PM / IP Logged

If you've got good straight cuts and a good corner fit, don't worry about not being able to get the caulk into the corner. Things like that are part of life.

For pics, I always opened my pic in MS Picture It (or any photo editor) and then did a quick downsize. Picture It has a quick "web quality" downsize button that does the job with one key stroke. The new web-ready pic is saved to your pics folder with the surname "web". Usually the size is under the max limit for this site. A lot of people, though, use a second site that stores pics. Then they link to the pic that way.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

methos123

Member - Posts: 42

Joined: July 08, 2009

Location: Arkansas, United States

Posted: July 17, 2009 at 5:17 PM / IP Logged

Thanks Stevdart. Here is some, including the crack I mentioned. More to come. I will show how the cuts and corner fit are not perfect in the next set of pics, but will be able to get it sealed by siliconing or gluing the outside seams of the side/corners in question? Thanks. ok, ok, box designing it is. - Page 2 -- posted image.

ok, ok, box designing it is. - Page 2 -- posted image.

methos123

Member - Posts: 42

Joined: July 08, 2009

Location: Arkansas, United States

Posted: July 17, 2009 at 5:20 PM / IP Logged

Oh yeah, I was wondering if I was supposed to plug in my box volume with the port volume taken out for the port length calculator like whiterob said, or if I was to put in the volume of the whole box with no port volume taken out like I did?

Thanks.

i am an idiot

Platinum - Posts: 13,714

Joined: September 21, 2006

Location: Louisiana, United States

Posted: July 17, 2009 at 5:56 PM / IP Logged

methos123 wrote:

I always thought the clamps were for DIY'ers.

I thought you WERE Doing It Yourself.

Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB

stevdart

Platinum - Posts: 5,816

Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: July 17, 2009 at 6:26 PM / IP Logged

Figure net volume: take out the entire part of the structure that specifically is there for the purpose of porting; the inside air that is dedicated to the driver (but not to the port) is the net air volume. That's why you end up having to figure and refigure a hundred times when you are venting a box.

When you get the face baffle glued onto the box, part of the glueing will be to that cracked inside baffle. It won't amount to anything to be concerned about once it's reinforced with the face baffle.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

methos123

Member - Posts: 42

Joined: July 08, 2009

Location: Arkansas, United States

Posted: July 17, 2009 at 7:30 PM / IP Logged

Ok, I made a mistake and the box is going to be 24.5 long, 15 high, 18.5 wide (outside dimensions). Please help me figure out how long my port should be to be tuned to 30hz if it is 2 wide x 13.5 high. Also how much volume will my final box be minus the port. I got a little confused when whiterob corrected me.

thanks

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