Another LTD02 Sub Design - 18D sub - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 11 Old 11-20-2018, 07:31 PM - Thread Starter
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Another LTD02 Sub Design - 18D sub

John came up with this form factor for my space reqs to line up Jbl4722s long back and time has come to execute the build

Driver : UM18-22

18D Sub in LTD02 words:
This cab works out to about 8.1 c.f. before driver and bracing, so about 7.6 c.f. net after everything. Port is 44" long, 2.5" tall, 21" effective width. Effective length is about 46.5" and then there is about a Hz of further adjustment required for this style of cab, so tuning should come in around 18.3Hz +/-.


If you will be standing the cab in the vertical position, you may want to lower the driver a bit for slightly better resistance to vibration.


Bracing is up to you of course, but make sure that it is rock solid.


Port velocity and first port resonance will be fine.


If you had something else in mind, we can modify the cab no problem. Just let me know what you would like.


















Cut List (for single Baffle).

sides 18 x 48 (2)
top 18 x 16.5 (2)
Back 16.5 x 46.5 (1)
Port 16.5 x 26 (1) Back
Port 16.5 x 14.75 (1) Bottom
Baffle 16.5 x 43.23 (1)
Port Rail 2.5 x 17.25 (2)
Port Rail 2.5 x 46 (2)
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Last edited by Rcris; 08-19-2019 at 09:10 AM.
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post #2 of 11 Old 11-20-2018, 07:31 PM - Thread Starter
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post #3 of 11 Old 11-20-2018, 07:32 PM - Thread Starter
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Will EP4000 be sufficient to drive these to make some bass?
EP4k has built in high pass filters 5hz, 30hz, and 50 hz and these boxes are tuned to roughly 17hz.



Should I buy a minidsp or can get away with 30hz high pass for the time being. I'm sure a minidsp is a must at this stage to make use of the available amp, but which minidsp. Reading through the each component In/Out sensitivities but sure I can get a direct tested solution here quickly.

Last edited by Rcris; 01-07-2019 at 11:05 AM.
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post #4 of 11 Old 01-07-2019, 11:42 AM - Thread Starter
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some build pics





















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Last edited by Rcris; 01-07-2019 at 11:47 AM.
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post #5 of 11 Old 01-27-2019, 06:38 PM - Thread Starter
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Its done !! They sound fantastic























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Last edited by Rcris; 01-27-2019 at 06:47 PM.
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post #6 of 11 Old 01-28-2019, 05:45 AM
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Looking very nice. I love the stuffed animal as a size reference. I found my 4 year old hiding in my sub box once when i was working on it.
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post #7 of 11 Old 01-28-2019, 06:00 AM
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Quote:
Originally Posted by Randy_J View Post
Looking very nice. I love the stuffed animal as a size reference. I found my 4 year old hiding in my sub box once when i was working on it.


Holy crap!!! That’s a big box!!!


Sent from my iPhone using Tapatalk
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post #8 of 11 Old 01-28-2019, 07:23 AM
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Holy crap!!! That’s a big box!!!


Sent from my iPhone using Tapatalk


Lol. That is my box for a Hs-24. My boy is on the smaller side to so that helps but the 24's are monsters. We are moving now through so that box will probably never see use. Now it is time to go ported possibly. I never ordered my amp so once we are in to the new place i will have to do that .
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post #9 of 11 Old 01-28-2019, 08:35 PM
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well done!!

Listen. It's All Good.
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post #10 of 11 Old 05-21-2020, 01:17 PM
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Wow - very impressive build. I too am looking to build a sub based on the UM18-22 subwoofer -

How did you determine the proper cabinet size and where to put bracing?
You mentioned that John came up with this design? How to I get in touch with him, would like a design closer to 38 to 40 inches in height.
Thanks
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post #11 of 11 Old 05-22-2020, 08:16 PM
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Quote:
Originally Posted by lyle2321 View Post
Wow - very impressive build. I too am looking to build a sub based on the UM18-22 subwoofer -

How did you determine the proper cabinet size and where to put bracing?
You mentioned that John came up with this design? How to I get in touch with him, would like a design closer to 38 to 40 inches in height.
Thanks
This might help.....https://www.avsforum.com/forum/155-d...tysub-faq.html
The MINI MARTY is is the size range that you are looking for that can use the UM18.....


Juju
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Sub List: 1- Red Five Mini V1 Devastator 18" w/PA460, 1- Red Five Devastator LFE 21", 1- Red Five Devastator 21" Finalizer V2 DF , 1- BOSS platform [The Hideaway Theater], 2- 18" "Full Marty" tuned to 17Hz w/RSS460HO
Wish List: Anthology http://www.speakerdesignworks.com/Anthology_1.html

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