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Discussion Starter #1
Long time lurker first time poster. I recently aquired 2 CSS SD12 drivers that I would like to build an enclosure for. I'm not looking for max spl as much as capable of low freqeuencies. I would like to keep it around 8 cubic foot internal, ported for a 15 hz or lower tune. I have downloaded WinISD pro but am not comfortable enough with my skills with it to try and design a dual driver ported cabinet. I've searched and can't seem to find what I'm looking for in a tried and true design. Any help would be greatly appreciated.
 

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Discussion Starter #3
Thanks for the welcome. I'll be using an external pro amp. I currently have a Behringer A500 that I will be using until I get a couple of other things upgraded. I'll most likely be purchasing the ED sub eq with HPF as well. I know I'll be needing the high pass filter in a ported design, I'm just not 100% sure yet what I'll be using. I plan to get a more powerful Behringer in the future to get the most I can out of the SD12's
 

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Then let's plan for the power in the future.

SPL would be 110 db at 15 hz, plus room gain. Cone excursion is reached with 1000 watts input power and a high pass filter at 14 hz. A 6 inch diameter port needs to be 37.75 inches long to tune the cabinet to 15 hz, add an inch to the length if going with a flared port. Port air speed is under 26 m/s at 14 hz.

Twin SD12 SPL.JPG
Twin SD12 Excursion.JPG
Twin SD12 Air Speed.JPG
 

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Discussion Starter #9
I can do that. I enjoy all the build threads so I might as well add to them. I've got them up and running in seperate enclosures that I already had. 1 sealed and 1 ported run in series with a jumper between the two. So far I'm really impressed with the SD12's but I know they can sound better. I picked them up on e-bay for $154 delivered for the pair. New and never used, couldn't pass them up for that.
 

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Discussion Starter #11
This project has been on hold for a while. We've been busy building our house. We are about to get the LR done and I'm about ready to get this project started. I plan to use a slot port 3 inches high. What would be the optimal width/length for the port for the 15 hz tune. Enclosure will be 8³ net with 3/4 MDF.
 

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Discussion Starter #13
My wife has decided she would rather have two smaller enclosures versus one bigger one. I'm looking at building the cabinets 19.5 X 16 X 32 inches high. Shes OK with that (and so am I). This should net about 4 cubic feet. Slot port should be 18 inches wide. Unless I'm doing something wrong in WinIsd it appears the air speed is too high with a reasonable length port configuration. Any help would be appreciated.
 

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Discussion Starter #16
The cabinet is built! Unfortunately the batteries were dead in my camera. I'll post some pictures of built cabinet and the finishing when I get to that.
I bought the SD12's used and they appear to be dual voice coil. I received no information when I bought them and they are no longer on the CSS web site as they have been discontinued. Does anyone know the impedance of the voice coils?
I can't wait to hear these. They are built like tanks.
 

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Discussion Starter #18
Thanks for the link.
I had a print of that but couldn't find what I needed.
Thanks for all the help Mike it is truly appreciated.
 

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The cabinet is built! Unfortunately the batteries were dead in my camera. I'll post some pictures of built cabinet and the finishing when I get to that.
I bought the SD12's used and they appear to be dual voice coil. I received no information when I bought them and they are no longer on the CSS web site as they have been discontinued. Does anyone know the impedance of the voice coils?
I can't wait to hear these. They are built like tanks.
Hi,

Not sure what you have but they were single 4 ohm voice coils.

Bob
 
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