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Old 3rd June 2012, 06:36 PM   #1
nelnar is offline nelnar  Brazil
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Join Date: Oct 2010
Default SUBWOOFER LT

Please help me!
Based on this project, which contains two driver 300w RMS each.
I would take the same project, and use only one driver.
How would the measures?
Considering the driver specifications:

Modelo 12SW3D6 12"
Diametro: 12"
Pot. RMS: 300 WRMS
FS: 23.40 Hz
Qes: 0.347
Qms: 3.908
Qts: 0.318
Vas: 175.5 Lts.
Xmax: 13 mm
No: 0.631 %
Sens.: 90.02 W/m
Sd: 53.093 m
Le: 1.9 mH
Re: 2.4 ohm
Bl: 10.36 Tm
Attached Images
File Type: jpg bi dad.jpg (39.2 KB, 907 views)
File Type: jpg S2020826.jpg (17.8 KB, 885 views)
File Type: jpg S2020761.jpg (53.2 KB, 886 views)
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Old 3rd June 2012, 06:59 PM   #2
sreten is offline sreten  United Kingdom
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Join Date: Nov 2003
Location: Brighton UK
Hi,

If the design is any good, and I'm not saying it is, half the internal
depth dimensions and the front opening and leave everything else
as it is for one driver.

More succinctly half the effective CSA and volumes for one driver,
if you make it narrower don't reduce the depth so much. Having
said that the design doesn't look right to me, YMMV.

rgds, sreten.
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There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

Last edited by sreten; 3rd June 2012 at 07:03 PM.
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Old 3rd June 2012, 11:09 PM   #3
nelnar is offline nelnar  Brazil
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Join Date: Oct 2010
So I figured halve the measures of the original design.
Now, I am in doubt.
My idea would be so! (photo attached)
Considering the parameters of the drive, is it correc
Attached Images
File Type: png mini dad bass.png (22.2 KB, 858 views)
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Old 3rd June 2012, 11:15 PM   #4
nelnar is offline nelnar  Brazil
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Join Date: Oct 2010
Quote:
Originally Posted by sreten View Post
Hi,

If the design is any good, and I'm not saying it is, half the internal
depth dimensions and the front opening and leave everything else
as it is for one driver.

More succinctly half the effective CSA and volumes for one driver,
if you make it narrower don't reduce the depth so much. Having
said that the design doesn't look right to me, YMMV.

rgds, sreten.

So I figured halve the measures of the original design.
Now, I am in doubt.
My idea would be so! (photo attached)
Considering the parameters of the drive, is it correct ?
Attached Images
File Type: jpg big dad bass.jpg (39.2 KB, 845 views)
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Old 3rd June 2012, 11:39 PM   #5
sreten is offline sreten  United Kingdom
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Join Date: Nov 2003
Location: Brighton UK
Hi,

FWIW the box doesn't look remotely suited to the driver parameters to me.
If the drivers specs are accurate I'd go for a vented box any day of the week.
Any driver that can be vented to 22Hz simply doesn't need a TL of any sort.

rgds, sreten.
Attached Images
File Type: png guff.png (35.1 KB, 149 views)
__________________
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

Last edited by sreten; 3rd June 2012 at 11:48 PM.
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Old 4th June 2012, 12:15 AM   #6
bjorno is offline bjorno  Sweden
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Join Date: Mar 2005
Location: Jacobsmountain
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Quote:
Originally Posted by nelnar View Post
So I figured halve the measures of the original design.
Now, I am in doubt.
My idea would be so! (photo attached)
Considering the parameters of the drive, is it correct ?
Hi,

It seems to be a correct length of the internal airways but the cross sectional areas don't suit your driver at all even if cut in half.

BTW. You have to completely re-design the two driver enclosure because the drivers are lined vertically not horizontally.

If the drivers had correct T/S parameters and if were paced horizontally you could have divided(vertically) the enclosure cut in two equal halves.

Have a look at the submitted picture where an OD-TL of similar length is shown at the bottom using your driver T/S.

This TL starts with an area(S1) equal to the driver Sd and is terminated with an area of Sd/3(= S4) and a total air-ways length of 16+255+16 = 287 cm counted from the S1 area ending at the terminating port(S4) . The FR is shown too.

Compare: IMO a much better use of your driver would be to convert the OD-TL to a T-TQWT= the rest of the simulations.

b
Attached Images
File Type: jpg Nar Audio Subs 12sw3D6.JPG (321.2 KB, 197 views)
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Old 6th June 2012, 03:05 AM   #7
nelnar is offline nelnar  Brazil
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Join Date: Oct 2010
bjorno you very smart and intelligent, researched the driver nar - 12SW3.
Thank you.
But, my friend, I have no knowledge of your transmission line, but like to put a hand on a saw and work.
What steps you recommend to me just a driver?
Whereas the original design with two speakers.
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Old 6th June 2012, 11:39 PM   #8
bjorno is offline bjorno  Sweden
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Join Date: Mar 2005
Location: Jacobsmountain
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Quote:
Originally Posted by nelnar View Post
...What steps you recommend to me just a driver?
..Whereas the original design with two speakers...
Hi,

This is a DIY forum. Why not help yourself ....Here are a couple of hints on how to interpret the HR layout dimensions for one driver:

b
Attached Images
File Type: jpg Nar Audio Subs 12sw3D6_T-TQWT-and-OD-TL.JPG (606.4 KB, 223 views)
File Type: jpg Wavecor-T-TQWT_example.JPG (329.8 KB, 334 views)
Attached Files
File Type: zip Nar Audio Subs 12sw3D6_T-TQWT-and-OD-TL.zip (269.1 KB, 44 views)
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Old 7th June 2012, 05:56 AM   #9
nelnar is offline nelnar  Brazil
diyAudio Member
 
Join Date: Oct 2010
Quote:
Originally Posted by bjorno View Post
Hi,

This is a DIY forum. Why not help yourself ....Here are a couple of hints on how to interpret the HR layout dimensions for one driver:

b

bjorno!
You are a man of good will to teach!
Makes two hours I'm racking my brain with its layout.
I apologize for my ignorance. But I'm learning from you.
And this is very good, therefore, does require a lot of intelligence.
About the size of the transmission line I understood.
Now do not get on S1, S2, S3 and S4. These measurements are in centimeters?
For the time being grateful for its lessons and dedication, but if you can help me!
Attached Images
File Type: png my first subwoofer.png (33.1 KB, 281 views)
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Old 7th June 2012, 07:58 PM   #10
nelnar is offline nelnar  Brazil
diyAudio Member
 
Join Date: Oct 2010
Quote:
Originally Posted by nelnar View Post
bjorno!
You are a man of good will to teach!
Makes two hours I'm racking my brain with its layout.
I apologize for my ignorance. But I'm learning from you.
And this is very good, therefore, does require a lot of intelligence.
About the size of the transmission line I understood.
Now do not get on S1, S2, S3 and S4. These measurements are in centimeters?
For the time being grateful for its lessons and dedication, but if you can help me!

Softwarer What are you using for these calculations?
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