***SEOS 12 / DNA-360 / Eminence Delta 12LFA Curved Build*** - AVS Forum
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post #1 of 218 Old 03-03-2013, 03:47 PM - Thread Starter
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For all those following the SEOS craze here is another entry into the chronicle. There are many designs floating around for the SEOS 12 due to its cost effectiveness and the DIY community rallying around the cause.

There are many woofer choices out there. I happened upon several Delta 12LFAs for a good deal sometime during the group buy when Erich was taking pre-orders. I did some research and found that Wayne over atPi Speakers used the Delta 12LFA as a woofer choice in his 3pi speaker offerings. In a brief exchange with Wayne on his forum I found that the Delta 12LFA was relatively flat and a worthy choice for a woofer in a high efficiency design crossed 900-1200.

I picked up 4 LFAs and pre-ordered with the regular bunch on here throughDIYSG. Shortly after I contacted Bwaslo about working up a crossover for the LFA. I shipped him a woofer and hedid the workand donated it to me and the rest of the DIY Community.

The box alignment and crossover discussion can be found here, but below is the final crossover he came up with:



The reason for the detail surrounding the woofer choice is there are several woofer choices out there now and the reason I chose this woofer is not b/c I feel its necessarily superior but for a few reasons:

- I got 4 D12LFAs for $200 shipped on a used deal
- The D12LFA works good in a sealed cab 2.0-2.5ft^3 with a F3 about 80Hz.
- Bwaslo was kind enough to work me a crossover for it.


Since the drivers and hardware are now discussed. Lets discuss enclosure. I wanted to use a sealed alignment. All my subs are sealed and I have ample mid-bass to the point that I didn’t feel the need to tune lower to try to make the mains work lower into the mid-bass area. I am building the “test” box to 2.5 before drivers and bracing which I feel will net somewhere 2.2-2.0 ft^3.

Here is an excursion plot with 2.5ft^3 and a 80Hz 12db/octave crossover eating 125W. I have never needed to crossover lower in my room but I run a multiple sub setup and active EQ.

Delta12lfaexcursion_zps8640880c.jpg




There have been some really sweet SEOS designs coming out lately. I have been just watching a drooling while you guys build some killer speakers. However, thanks to all of you, I would not be happy with yet another build. Thanks to you I talked myself into a curved build. The resource I used for kerfing is found here.

Now, this is a prelim post and I’ll clean it all up Later.

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post #2 of 218 Old 03-03-2013, 03:49 PM - Thread Starter
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Enclosure































BF328257-886C-4C48-AB9E-0BE2842598FB-1937-000004D4E3D7A125_zps10e86a57.jpg

6EBFEF7B-EC6A-4834-9AD4-080AAB64208D-190-000000133351E48D_zps4673d721.jpg

9ECE949D-9555-4EB8-A46D-838CDCB8606A-190-0000001386B6F326_zps01a2daf0.jpg

Detail of dual radius. 3/4" was too big and spilled into waveguide so i did this:
AE66F35C-43EB-4F86-ABB6-C074E066871E-190-00000013B453720B_zpsa5b93690.jpg

760A4EF5-6CB9-4D00-B2C1-69FBAC4F4364-190-00000013C42B1BAD_zpsc9b0b58c.jpg

330A17DE-F086-4009-843C-94067DAA4F47-190-00000013D6A76003_zps6c2ce3a7.jpg

Cut off training wheels and now its a true curved cabinet

DE54E062-8B25-4E4C-A9FB-4FB9C0A252FE-190-00000013EA899F29_zps36e57571.jpg

8161E49B-07FC-4933-BE0C-EB76B93C1ADC-190-00000013FE47C15B_zpsd0fd39ab.jpg

D84B1776-2AFB-494D-9AC3-7775BFEB4078-190-0000001414313E2F_zps859854ab.jpg

619620F2-B51C-41B8-B4DE-81F8308161D4-190-00000014280CB3FF_zps8e535aba.jpg

D05DC4E2-68E6-4642-B37D-46DD5D25FF3B-190-0000001437C9ED2A_zps91833aca.jpg

CD682D26-8E43-4C5B-A686-0A404097B4FC-190-000000145866BFE1_zps186eb5ca.jpg

1C54E75C-B70D-4E9D-A1AA-900685138E51-190-00000014464AB17D_zps2216d054.jpg

B2F3A712-8A26-42CC-B62B-D2D8DE049730-190-000000147C339132_zps9a29239d.jpg

8C89E7B2-64EB-4C60-9C41-477D96106DBC-2205-0000037C88F1FDE6_zpse2627625.jpg

59567FCF-3635-4DC3-BA4C-372E9A546FA5-2205-0000037C916E3AD8_zpsd0a94bc3.jpg

With one complete I did some preliminary measurements to confirm crossover accuracy and get rough idea of frequency response:







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post #3 of 218 Old 03-03-2013, 03:50 PM - Thread Starter
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Crossover

Prelminary Layout:

5AEA6561-9ED6-4E76-AE3C-8F06741EF25D-960-0000018E3C24B57E_zps491709f5.jpg

76634172-A21A-4E61-87DA-BBC94929C873-1613-000002A58375F0E0_zps1adba24a.jpg

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post #4 of 218 Old 03-03-2013, 03:50 PM - Thread Starter
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Duratexing and Final Assembly.....









































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post #5 of 218 Old 03-03-2013, 03:50 PM - Thread Starter
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RESERVED

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post #6 of 218 Old 03-03-2013, 04:26 PM
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Very cool cool.gif

I always like curved cabs, I have wanted to try one for some time. I like the dual panel idea, how thick a blade did you use for the kerf cuts?
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post #7 of 218 Old 03-03-2013, 04:39 PM - Thread Starter
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I used a standard 1/8" blade.

If you follow the hyperlink that guy with the how to has done a lot to make kerfing easier for the layperson. There is a little trigonometry in there but not much. I found the info invaluable I can't imagine doing this by trial and error.......

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post #8 of 218 Old 03-03-2013, 05:00 PM
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Cool cabs! Looking forward to following the rest of the build and hearing your listening impressions. cool.gif
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post #9 of 218 Old 03-03-2013, 07:28 PM
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Nick + SEOS = Awesome
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post #10 of 218 Old 03-04-2013, 06:03 AM
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Love the curved cabinets!! Can't wait to see these all finsihed up.
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post #11 of 218 Old 03-04-2013, 06:26 AM - Thread Starter
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Quote:
Originally Posted by Gorilla83 View Post

Cool cabs! Looking forward to following the rest of the build and hearing your listening impressions. cool.gif

Thanks G!

Quote:
Originally Posted by Java View Post

Nick + SEOS = Awesome

Javajava, hope i dont let you down!

Quote:
Originally Posted by ChopShop1 View Post

Love the curved cabinets!! Can't wait to see these all finsihed up.

Thank Chopshop1,

The curve adds a bit of difficulty but i learned a lot doing the first one.

Bear with with me guys its gonna be a slow build. Im building one complete without finish to measure. Once measurement is done and im sure crossover wont require any tweaks ill press on with the other two.

Bwaslo measured the drivers separate and worked the crossover in pcd but i want to see in box combined measurents before i solder up the rest of the crossovers.

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post #12 of 218 Old 03-04-2013, 07:08 AM
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Awesome looking speakers! congrats bro
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post #13 of 218 Old 03-04-2013, 04:40 PM - Thread Starter
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Thanks Nezff!

Added more bracing:
44D12B9B-70F2-446A-AADC-4C55AC8A6717-1613-000002A2BF4FFDB3_zps32da9639.jpg

96E3DB48-8D2D-41A3-AD86-8FF5CBB44D6F-1613-000002A365F40700_zps3203e794.jpg

Crossover all soldered up......

76634172-A21A-4E61-87DA-BBC94929C873-1613-000002A58375F0E0_zps1adba24a.jpg


Additionally, duratex came in today and also socket head screws.

Thats all the supplies i need now i just gotta press thru the labor part......

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post #14 of 218 Old 03-04-2013, 06:31 PM
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Very cool Nick. You never fail to impress
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post #15 of 218 Old 03-04-2013, 09:45 PM
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Nick this looks amazing cant wait to see the finished product! The only problem is my SEOS thread is probably not going to get any traction now because everyone will be watching this! lol!

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post #16 of 218 Old 03-05-2013, 04:49 AM
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SEOS + Curved Cabinet + Bill Waslo Crossover = One to watch!

I've enjoyed reading so much of the enthusiasm wrt the SEOS builds. Although I'm not currently interested in a build for myself, nor do I need one .... I really dig watching these various builds. And it's quite refreshing seeing a build variant w/the curved cabinet, and any other trend toward possible additional refinement.

Best of luck Nick

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post #17 of 218 Old 03-05-2013, 04:57 AM
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Wow those cabinets remind me of the B&W 800 Diamonds/Nautilus! Very unique and bad a**!
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post #18 of 218 Old 03-05-2013, 05:15 AM - Thread Starter
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Thanks Guys.


Question: What size socket head screws do you guys recommend for mounting the woofer 8 or 10?

I ordered 6s from microfasters which looks like they will work for the waveguide but a little small for the woofer.

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post #19 of 218 Old 03-05-2013, 02:45 PM
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I'm using 10 (with a 2512). The thicker screws seem like the better choice to me.

Sounds Good to Me... keeping track of my audio projects.

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post #20 of 218 Old 03-05-2013, 03:43 PM
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Wow, very cool build. Wish I had the ability to pull off curves. Well done so far.
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post #21 of 218 Old 03-05-2013, 05:07 PM - Thread Starter
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Quote:
Originally Posted by Scott C. View Post

I'm using 10 (with a 2512). The thicker screws seem like the better choice to me.

Thanks! I was thinking 10s too.

Quote:
Originally Posted by tuxedocivic View Post

Wow, very cool build. Wish I had the ability to pull off curves. Well done so far.

Thank your sir, but i havent "pulled it off" Yet! wink.gif

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post #22 of 218 Old 03-06-2013, 04:48 AM - Thread Starter
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Well, It looks like I goofed the inductor orientation. Seems like the below is bad:

67691

67692


Is this bad? should I lay down the farthest right inductor and stand up the farthes left?


Inductor.jpg 22k .jpg file

Inductor.jpg 27k .jpg file
Attached Images
File Type: jpg Inductor.jpg (27.0 KB, 962 views)
File Type: jpg Inductor.jpg (22.1 KB, 964 views)

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post #23 of 218 Old 03-06-2013, 06:25 AM
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no, those two look fine. imagine flux lines streaming out through the center hole of one coil. what you don't want is for them to easily stream through the center of the other coil from one side. in your arrangement any flux from one coil wouldn't easily enter the other and any that does would enter equally from either end of the hole. So coupling would be nil.
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post #24 of 218 Old 03-06-2013, 06:39 AM - Thread Starter
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Awesome!

Thanks for the post Bill.

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post #25 of 218 Old 03-07-2013, 04:15 PM - Thread Starter
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Added top and bottom;

B58F4A57-979A-4E70-A1A2-2720DE4D124B-3160-000005F9F44C31ED_zps35a55c39.jpg

90F58964-78DD-4803-8230-95871864940D-3160-000005FA1C9B7F45_zps2e00ef44.jpg

Now this part im a little embarrased to show. Since my brain was on overload i didnt include a front to back brace for the baffle. I always knew i wanted one but wasnt sure where to put it.... The final two boxes will have this brace integrated into the window bracing.

Anyways here it is(as my OCD eye twitches) Argh!!!!!!

B251026A-9CD6-46CB-845B-EC1383851BD9-3160-000005FA38A0728A_zpsc343105f.jpg

I gets dark too quick! Im over winter now, summer time! I might just get this thing together before I go on vacation for a listen.........

Countdown, im leavin 16th!

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post #26 of 218 Old 03-07-2013, 08:06 PM
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Looks like something I would have done, but at least it is going to be fine function wise. After the front baffle in in place nobody will know the difference. Anyway, it is going to be a nice build.

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post #27 of 218 Old 03-08-2013, 07:18 AM - Thread Starter
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Your right, it won't matter.... Its just so darn ugly.

Hopefully no one will quote that image and I'll just edit in the pretty boxes from the L and R build. This is my first curved build so technically its a prototype. I do intend to use it though as it should be functionally equivalent.cool.gif

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post #28 of 218 Old 03-08-2013, 02:49 PM
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Quote:
Originally Posted by NicksHitachi View Post

Your right, it won't matter.... Its just so darn ugly.

Hopefully no one will quote that image and I'll just edit in the pretty boxes from the L and R build. This is my first curved build so technically its a prototype. I do intend to use it though as it should be functionally equivalent.cool.gif

Image>Rotate 90

Right Click>Set as Desktop
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post #29 of 218 Old 03-12-2013, 04:59 AM - Thread Starter
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Measured progress this weekend. Did flush trim on the top/bottom and added double baffle.


Completion Checklist
  • Rout recesses
  • Install terminal cup
  • Install crossover
  • Install drivers
  • measure and confirm no crossover crossover tweaks needed
  • Perform roundovers and pretty up cabinet
  • Apply Duratex


It might seem I stalled a bit, as I'm going on vacation. So no updates or progress until I get back on the 26th. Its so hard for me to put this project down and walk past it every day!!! However I'm off of work most of the week after I return so I'm hopeful to at least get some measurements by that week of the 31st..........

Then I gotta crank out the last two.

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post #30 of 218 Old 03-12-2013, 05:15 AM
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I can't believe that you are going to duratex those awesome cabinets instead of using a nice stain or at least some glossy paint! That absolutely pains me to think about! But, it's your baby and if you want to duratex then I can't stop you. I am looking forward to seeing them completed!
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