SDX 12 Ported - Home Theater Forum and Systems - HomeTheaterShack.com

 
Thread Tools
post #1 of 9 Old 07-30-13, 09:03 AM Thread Starter
Banned!
Chad
 
Join Date: Jun 2009
Posts: 169
My System
SDX 12 Ported

Need to know what port lengths to use for a ported SDX12? I emailed CSS about the idea of using a SDX12 in the DIY sound group 4 cuft flat pack and it looks like it would work pretty well using the Dayton SPA1000. Would like to have it tuned around 15-18hrz or whatever the HPF is on the off the shelf Dayton SPA1000.

Kind of gathering different DIY options for mostly hometheater and while I thought I was set on dual 15"s sealed I just keep coming back to XBL2 options to match the Arx XBL2 setup. Super impressed with XBl2 and a 1000 watt ported SDX12 might be one powerful option for hometheater.
gtpsuper24 is offline  
Sponsored Links
Advertisement
 
post #2 of 9 Old 07-30-13, 07:41 PM
HTS Moderator
doug
 
Join Date: Dec 2009
Location: Kansas City
Posts: 1,255
My System
Re: SDX 12 Ported

I love my SDX15 ported set. They have truly amazing sound. I was going to try and help with the lengths, but can't find the file for winISD, but when I find it I can run it.
dougc is offline  
post #3 of 9 Old 07-30-13, 09:47 PM Thread Starter
Banned!
Chad
 
Join Date: Jun 2009
Posts: 169
My System
Re: SDX 12 Ported

I know CSS said in the email they model it for me and said 4cuf ported works great and works perfect with the SPA1000 HPF around 16-18hrz but they never told me what port lenghts to use or what lenghts they used for the model. The flat pack uses dual 3" ports.
gtpsuper24 is offline  
post #4 of 9 Old 07-31-13, 12:47 AM
HTS Moderator
doug
 
Join Date: Dec 2009
Location: Kansas City
Posts: 1,255
My System
Re: SDX 12 Ported

OK, my modeling skills in winISD are horrible, but for a tuning of 18hz, I come up with two 3" and 27" long round ports with your 4 cubes box, and 1000w with a LR HPF at 18hz giving you a port air speed of 24 m/s, 1st resonance at about 250hz.
dougc is offline  
post #5 of 9 Old 07-31-13, 06:43 PM
Elite Shackster
 
Mike P.'s Avatar
Mike
 
Join Date: Apr 2007
Location: Chitek Lake, Sask.
Posts: 19,397
Re: SDX 12 Ported

Somethings not quite right with your modeling. 2 four inch flared ports 40 inch long each would tune the cabinet to 20 hz and the air speed would be 28 m/s peak.

We're all in this together!


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

Mike P. is offline  
post #6 of 9 Old 07-31-13, 07:30 PM
HTS Moderator
doug
 
Join Date: Dec 2009
Location: Kansas City
Posts: 1,255
My System
Re: SDX 12 Ported

I thought I finally had it figured out! I added a HPF to the model and it lowered the air speed quite a bit. Is that where I messed it up Mike?
dougc is offline  
post #7 of 9 Old 07-31-13, 08:01 PM Thread Starter
Banned!
Chad
 
Join Date: Jun 2009
Posts: 169
My System
Re: SDX 12 Ported

Quote:
Mike P. wrote: View Post
Somethings not quite right with your modeling. 2 four inch flared ports 40 inch long each would tune the cabinet to 20 hz and the air speed would be 28 m/s peak.
The flat pack I want to use is this one http://www.diysoundgroup.com/subwoof...flat-pack.html

It has cutouts for dual 3" ports, so maybe the air speed will be too high with that small of ports?

Heres my email I got when I asked about the 4cuft flat pack:

Here is Jeff Bagby response:

Yes. It will work. I was skeptical at first, because the box is too large
for the woofer, and when modeled in this size box there is peak in the
response at 18-20Hz. However, if a plate amp is used that has a subsonic
high-pass in this region it flattens the response out very nicely. It looks
especially nice with the Dayton 1000 Watt amp. With it is flat to about 16hz
and with the 1000 Watts it hits 25mm of peak excursion, which makes good use
of the driver. It really is an ideal combination. The other sub amps looks
good too, but this design needs a subsonic filter in the 16-20 Hz range to
control the cone.

Thanks
Bob



But they never mentioned what port lenght they used.
gtpsuper24 is offline  
post #8 of 9 Old 07-31-13, 10:27 PM
Elite Shackster
 
Mike P.'s Avatar
Mike
 
Join Date: Apr 2007
Location: Chitek Lake, Sask.
Posts: 19,397
Re: SDX 12 Ported

From Bobs response I assume he is unaware the ports are 3" diameter.

Doug, here's the project file for this. Compare it to your modeling to see where the difference is.

SDX12 Ported.wpr

We're all in this together!


To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

Mike P. is offline  
post #9 of 9 Old 07-25-14, 08:28 PM
Shackster
 
Join Date: Mar 2014
Posts: 12
Re: SDX 12 Ported

Hi i am also interested in a ported sdx 12 with dayton 1000 watt amp..but i have the option to build my box..what is the best size box for this set up.for the deepest bass responce..would slot port be better..any help with the desing of the box would be grealty apreciated.. and i also want ot design one for the sdx 10 with a css pa 500 watt amp.. help needed please..
seas is offline  
Reply

Bookmarks

Tags
12 , ported , sdx

Quick Reply
Message:
Options

Register Now




PLEASE COMPLETE ALL REQUIRED FIELDS BELOW... THANKS!

REQUIRED FIELDS ON THIS PAGE
YOU MUST COMPLETE ALL OF THESE

Username
Password
Confirm Password
Email Address
Confirm Email Address
Random Question
Random Question #2




User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
PLEASE READ BELOW PRIOR TO ENTERING AN EMAIL ADDRESS!

ATTENTION!

YOU MUST ACTIVATE YOUR ACCOUNT!

Activation requires you reply to an email we will send you after you register... if you do not reply to this email, you will not be able to view certain areas of the forum or certain images... nor will you be able download software.

AN INVALID EMAIL ADDRESS WILL CAUSE YOUR ACCOUNT TO BE DELETED!

See our banned email list here: Banned Email List

We DO NOT respond to spamcop, boxtrapper and spamblocker emails... please add @hometheatershack DOT com to your whitelist prior to registering or you will get nowhere on your registration.


Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML is not allowed!
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


For the best viewing experience please update your browser to Google Chrome