Box making experts!
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=55744
Printed Date: October 31, 2024 at 6:41 PM
Topic: Box making experts!
Posted By: Blackiewrx
Subject: Box making experts!
Date Posted: May 14, 2005 at 5:20 PM
Hello i need help designing a simple ported box for two audiobahn Flame compresion 12'' subs model AW1208T here is the link to their theil small perameters. https://www.audiobahninc.com/frame2004.html Thanks for your time! I just need internal airspace and port size. thanks. ------------- 03 wrx stage 4
Replies:
Posted By: stevdart
Date Posted: May 14, 2005 at 5:30 PM
Not making any promises to you here, because...as Yoda would say, "Simple, this is not!" But you will have to give up a little bit more info in order for someone to give you a hand, such as: - How much total space do you have available, what is the vehicle, where is the enclosure going to be....things of that nature.
- How much power will be going to the pair of subs, and
- how will you have the sub pair wired, to what final impedance?
------------- 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: Blackiewrx
Date Posted: May 14, 2005 at 5:34 PM
I just need to know the internal air space and the length and size opening of the port. I can do all the rest of the calculations myself. I used to use this box making program at my work but i dont have access to that anymore. ------------- 03 wrx stage 4
Posted By: stevdart
Date Posted: May 14, 2005 at 5:42 PM
You misunderstand what I asked. Can you, for example, fit a 9 cubic foot enclosure? Do you like a lot of boom? or heavy on the bass? Or are you confined to use as small a volume as possible? There are a lot of ways to design an enclosure and one has to know these things. Here is a link to WinISD Pro that you can load up in the computer that you are using, and you can figure up a good design with it. https://www.linearteam.dk/default.aspx?pageid=winisdpro
Posted By: Blackiewrx
Date Posted: May 14, 2005 at 5:57 PM
Ok i see, im sorry. its for the back of a new celica i got around 41 inches wide and i cant go any taller than 15 inches, the depth is whatever i needs it to be, i would like the box to be tuned for a lots of boomy bass but still sound ok with music, its for like a 18 year old bass head. thanks.!!
------------- 03 wrx stage 4
Posted By: Blackiewrx
Date Posted: May 14, 2005 at 6:15 PM
i have that program and it said that i needed only 1.03 internal ft3 and the port was 4 inch diameter and 36.5 inches long. Im not to familiar with that program and these calculations just dont seem right to me. Can you check and see what you come up with? i must be doing somthing wrong.
------------- 03 wrx stage 4
Posted By: Blackiewrx
Date Posted: May 14, 2005 at 9:08 PM
Im trying to figure specs on a ported box for two audiobahn AW1208T 12''s . I dont think im using winisd pro correctly though because i get these specs ( 1.037 ft^3 internal volume and a port with a 4 inch opening and 36.5 inches long) this doesnt seem right to me though. what am i doing wrong?
------------- 03 wrx stage 4
Posted By: forbidden
Date Posted: May 14, 2005 at 9:38 PM
Why have you not looked on Audiobahn's website..... They show a box volume of 3.5 cubic feet (internal) with two 4" ports 13" long, so a box size of 7 cubic foot overall internal volume. BIG BAD BOOMIN BOX fo sho. Should thump hella hard for the 18 year old basshead. ------------- Top Secret, I can tell you but then my wife will kill me.
Posted By: Blackiewrx
Date Posted: May 14, 2005 at 10:11 PM
forbidden wrote:
Why have you not looked on Audiobahn's website..... They show a box volume of 3.5 cubic feet (internal) with two 4" ports 13" long, so a box size of 7 cubic foot overall internal volume. BIG BAD BOOMIN BOX fo sho. Should thump hella hard for the 18 year old basshead.
Is that all you do is just double the given spec for the one sub if your building a box for two? if they ask for 3.5 cubic feet i just double that if im doing two? what about the port do i just double the size of the opening and leave the length the same? I didnt think it was ok to do this????? ------------- 03 wrx stage 4
Posted By: shawn62
Date Posted: May 15, 2005 at 3:12 AM
I would also agree with forbidden on this one
offtopic here but forbidden you wouldnt happen to be from courtenay B.C. and own forbidden audio would you?
if you are then this is a small world cause I also live in courtenay
Posted By: stevdart
Date Posted: May 15, 2005 at 6:55 AM
Blackie, forbidden has shown you the light. You are probably not inputting parameters correctly in the program; for example, Audiobahn lists SD as M2, where most programs want cm^2.....so a listing of .044 M2 would translate to 444 cm^2. And possibly some other things, too. Take the considerable trouble to get all inputs correct. You also must know how these two subs are going to be connected if you are going to work up your own design....which is why I asked you in the beginning how the wiring was going to be done. You didn't answer that. If I were designing an enclosure I would input that necessary information. Use the site's tech support, go to 2004 Flame Compression, you have a choice of seeing PDF files for T/S parameters, suggested box specs and graphs. Use this information as it is already figured out for you. As forbidden has stated, the total cubic feet for one sub would be 3.5. Notice that they are kind enough to give you both net volume of 3.15 and total volume including port and driver displacement. Look at the box sizes, etc, given and choose the one with the response and size that will suit your purposes best. To build for two subs instead of one, separate the box into two chambers so that each chamber has the physical characteristics as outlined in the Audiobahn help. The two chambers must be sealed from each other. ------------- 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: Blackiewrx
Date Posted: May 15, 2005 at 11:16 AM
winisd already has the subs info in its list of subs that it gives you in the begining. are you saying that the information may not be right and i should enter in a "new sub" parameters? Also if i just choose one sub on win isd it give me this ----> internal volume of .5 cubic feet and a port with a 4 inch opeing thats 75 inches long!!!! that makes no damn sense and doesnt match audiobahns specs at all??? I also double check all the T/S parameters and they are right. What else could be wrong?? if i cant figure this out soon i will just make two seperate boxes with audiobahn recomendations, but i really wanted a to do a single port mono box, can someone enter the aw1208T into winisd and see what they come up with?? ------------- 03 wrx stage 4
Posted By: stevdart
Date Posted: May 15, 2005 at 11:46 AM
Read what I wrote in https://www.the12volt.com/installbay/forum_posts.asp?tid=50823&KW=WinISD Everything you're asking is explained in the Help section of WinISDPro. And yes, the parameters may be incorrect, so don't assume they're right. Picture this: the author of this program entered all those parameters for all those speakers himself. I can picture his eyes getting a little bit blurry by the time he got to the 30th Audiobahn model... ...and you'll see that I mention this 'recommended 4" x ___" ' port size in that thread. After reading what I said you'll understand more on how you are supposed to use the program. Besides all that... and I hope you read the linked thread and the entire Help section in WinISDPro.....you can easily convert the ports needed for two enclosures into one port for one combined enclosure. There are some calculators that help with that, some of which I linked to in that thread shown above. ------------- 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: Blackiewrx
Date Posted: May 15, 2005 at 12:00 PM
I double checked everything, the t/s perameters are right everything is fine and im still getting some imposible numbers out of it. try enetering a a simple vented box for one audiobahn aw1208t and you will get this a box that is .5 cubic ft and a port that is 75 inched long!?!?! This really make me wonder if WinIsd even works, i read the entire help section twice and re enetered all my information corectly and im still getting nonsense for a box design, the graph even looks like poop.
------------- 03 wrx stage 4
Posted By: stevdart
Date Posted: May 15, 2005 at 12:04 PM
What am I doing, talking to myself here??
Posted By: Blackiewrx
Date Posted: May 15, 2005 at 12:24 PM
Look man....... I know my problem im having is obviously somthing that im doing wrong, i admit that. But please understand that i have read the entire Winisd help section and all your other helpfull advice. I triple checked all the T/S perameters that i was using for the AW1208T on the winisd program but everytime i try to make even design a simple vented box for just one of those subs it gives me these specs " .5 ft^3 and a 4'' round port that 75 inches long" this i know is wrong and i know you know that its wrong too. Im really about to give up on this one, steve, i dont understand where i went wrong. Thanks for all your help though.
------------- 03 wrx stage 4
Posted By: stevdart
Date Posted: May 15, 2005 at 2:21 PM
Alright, I'll give it a look when I get the chance.
Posted By: DYohn
Date Posted: May 15, 2005 at 5:05 PM
Blackiewrx wrote:
.5 ft^3 and a 4'' round port that 75 inches long" this i know is wrong and i know you know that its wrong too. .
Nope, that would be correct. In a 0.5 cuft enclosure with a 4" port tuned to 29.5Hz, the port needs to be 75 inches long. Not a very logical setup, eh? It could be done, though. I'm thinking a snorkle port... The real problem is the T/S parameters given by Audiobahn are not correct. Those compression drivers exhibit really strange behavior and I will bet you a brand new bananna skin trombone that if you measure the actual performance for one of those drivers you'll get numbers WAY different from the published specs. 33l Vas for a 12" driver? Kinda small. In any case, just do what Audiobahn recomends and you'll get the best you can out of those things. They are really only good for high SPL noise anyway, so it's not like you're likely to hear any difference no matter what you do! ------------- Support the12volt.com
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