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3NE_SOUNDZ
PostPosted: Sun Mar 11, 2012 12:39 pm 
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Joined: Sat Nov 22, 2008 1:47 pm
Posts: 19
Need your advice on a box build for two sundown audio SA-8 dual 2ohm. Not so good at box building so any advice will help. This is what i came up with so far.

These measurements are external.

Height - 12"
Lenght - 21.5"
Depth - 13.5"
Wood thickness - 3/4"

That works out to 1.5 cubes for the internal volume. They recommend 0.5-0.75 ft^3 @ 35hz for 1 sub ported.

For the port i came up with this and its 1 port only. Not sure if i did this right to achieve around 35Hz.

Height - 10.5"
Width - 3/4"
Lenght - 9.5"
Wood thickness - 3/4"

SUB SPECS

RE: 3.28 ohms
FS: 41.6 Hz
VAS: 3.285 L
Qes: 0.513
Qms: 6.606
Qts: 0.476
Le: 2.778 mH
BL: 17.138 N/A
Mms: 175.654 g
Sens: 78.476 dB
RMS: 400 Watts

Let me know what you guys think. Should i go with a slightly bigger box and add internal bracing? Not sure how to minus for bracing and port as well. Any box ideas will help thanks.


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evolution7tt
PostPosted: Sun Mar 11, 2012 6:56 pm 
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Posts: 657
Location: South
Try using the RE Audio Box Calculator. It's free, google it.
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K. Gosine Audio
PostPosted: Sun Mar 11, 2012 7:03 pm 
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With 3/4 MDF you don't need bracing also for that box the cuts would not be large as to flex.

You can google Chris Torres box calculator and download it..it's the simplest and accurate one out.

Also for port area go with 12-16 square inches of port area per Cubic foot of box volume.

Stick to the recommended .5-.75 ft per sub.

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3stagevtec
PostPosted: Mon Mar 12, 2012 1:53 am 
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Posts: 8690
Location: killing two stones with one bird...
3NE_SOUNDZ wrote:
Need your advice on a box build for two sundown audio SA-8 dual 2ohm. Not so good at box building so any advice will help. This is what i came up with so far.

These measurements are external.

Height - 12"
Lenght - 21.5"
Depth - 13.5"
Wood thickness - 3/4"

That works out to 1.5 cubes for the internal volume. They recommend 0.5-0.75 ft^3 @ 35hz for 1 sub ported.

For the port i came up with this and its 1 port only. Not sure if i did this right to achieve around 35Hz.

Height - 10.5"
Width - 3/4"
Lenght - 9.5"
Wood thickness - 3/4"

SUB SPECS

RE: 3.28 ohms
FS: 41.6 Hz
VAS: 3.285 L
Qes: 0.513
Qms: 6.606
Qts: 0.476
Le: 2.778 mH
BL: 17.138 N/A
Mms: 175.654 g
Sens: 78.476 dB
RMS: 400 Watts

Let me know what you guys think. Should i go with a slightly bigger box and add internal bracing? Not sure how to minus for bracing and port as well. Any box ideas will help thanks.



http://www.jlaudio.com/header/Support/Tutorials/Enclosure+Ports/Tutorial%3A+Enclosure+Ports/656168

Quote:
Image

W / h
The ratio of W to h should not be any more than 9 to 1 to prevent tuning shifts introduced by excessive friction between the rapidly moving air and the port's surface. It should be noted that this is not a hard-and-fast rule, merely a rule of thumb to help you prevent a mis-tuning.

In short, keep the port as square as aesthetically and physically possible.


I didn't double check your calculations but once you follow Sundown's recommendations, you will be pleased.

The 12 - 16 square inches of cross sectional port area pre cubic foot of net internal box volume is good to follow as well.

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3NE_SOUNDZ
PostPosted: Mon Mar 12, 2012 10:37 am 
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Ricer

Joined: Sat Nov 22, 2008 1:47 pm
Posts: 19
Ok thanks guys. This is what i came up with. What you guys think?


Attachments:
SA-8 BOXX specs.jpg
SA-8 BOXX specs.jpg [ 100.73 KiB | Viewed 939 times ]
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3stagevtec
PostPosted: Mon Mar 12, 2012 1:38 pm 
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Location: killing two stones with one bird...
Looks good..

Post pics and a lil review when you done..

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black start
PostPosted: Sun Mar 18, 2012 11:57 am 
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real good info inside here

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3NE_SOUNDZ
PostPosted: Thu Mar 22, 2012 8:08 pm 
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Ricer

Joined: Sat Nov 22, 2008 1:47 pm
Posts: 19
Couple pics for you guys.


Attachments:
BOX 3.jpg
BOX 3.jpg [ 411.02 KiB | Viewed 764 times ]
BOX 2.jpg
BOX 2.jpg [ 245.77 KiB | Viewed 764 times ]
Box 1.jpg
Box 1.jpg [ 152.81 KiB | Viewed 764 times ]
Port.jpg
Port.jpg [ 106.63 KiB | Viewed 764 times ]
SA-8 1.jpg
SA-8 1.jpg [ 410.8 KiB | Viewed 764 times ]
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kurpal_v2
PostPosted: Thu Mar 22, 2012 10:27 pm 
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nice work man.


How does it sound?

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wanted
PostPosted: Thu Mar 22, 2012 11:59 pm 
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Street 2NR

Joined: Sun Jun 12, 2011 12:39 am
Posts: 66
I'll try to come down to Rienzi on Sunday and give you guys a demo of a Sundown 8.
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3NE_SOUNDZ
PostPosted: Sun Apr 01, 2012 5:50 pm 
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Ricer

Joined: Sat Nov 22, 2008 1:47 pm
Posts: 19
Here is a lil video for you guys.

http://www.youtube.com/watch?v=Zf0QyOZj ... e=youtu.be
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nervewrecker
PostPosted: Sun Apr 01, 2012 7:04 pm 
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Damn, those subs moving!
Vid looks good too, what did yo make it with?

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