JBL CX1200 Sealed Build - Planning phase - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 53 Old 06-29-2018, 12:57 PM - Thread Starter
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JBL CX1200 Sealed Build

Bought around 19 of them during BBs black friday sale and after reviewing several members experience and builds, I think I should go with sealed sub using them.

I'm planning to build put 4 drivers on each front corner behind the AT screen, preferably 2 in a one cab so easily movable when needed.

I still have to measure available space left next to the LCR, but I need advice on optimum enclosure volume for these 12s.


Is 6 ft3 per 2 drivers be good enough?

Last edited by Rcris; 07-30-2018 at 01:34 AM. Reason: JBL CX1200 Sealed Build
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post #2 of 53 Old 06-29-2018, 03:19 PM
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3 cf pr driver should work just fine. But you don’t need that big. I run 12 of these (exact same as CS1214 and GTX1200) in ~ 1cf pr driver enclosures, and have reference SPL down to 10 Hz, with a little EQ. All run by one Inuke 6K.

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post #3 of 53 Old 07-03-2018, 10:53 AM
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make it happen! excited to see the progress!
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post #4 of 53 Old 07-03-2018, 05:34 PM - Thread Starter
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make it happen! excited to see the progress!
you got it
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post #5 of 53 Old 07-03-2018, 05:37 PM - Thread Starter
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Finally decided to make a 6.5 cab to give 1.5 ft3 per driver
Outer dimensions of the box:
H= 60inch, W = 15.25, D=16.75. Single baffle only.


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post #6 of 53 Old 07-03-2018, 05:44 PM - Thread Starter
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test fit , dropped in 4 of them to glimpse of them .

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Last edited by Rcris; 07-03-2018 at 05:50 PM.
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post #7 of 53 Old 07-03-2018, 05:46 PM
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Rock on! I am betting you will be surprised with how good these sound....

I switched my enclosure (4 of them in 6cf) to my new EP4000 and love the combo.

Still working on getting the other 3 subs built....
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post #8 of 53 Old 07-03-2018, 05:54 PM - Thread Starter
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Original plan is to make double baffle, should I really need it. I just have to glue it and 4 more holes, but Do I?
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post #9 of 53 Old 07-03-2018, 05:54 PM
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Nice job
Now you only need to build the other 3 boxes

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post #10 of 53 Old 07-03-2018, 05:55 PM - Thread Starter
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I will let it sit overnight to air out silicone fumes, will paint it tomorrow
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post #11 of 53 Old 07-03-2018, 05:57 PM
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Quote:
Originally Posted by Rcris View Post
Original plan is to make double baffle, should I really need it. I just have to glue it and 4 more holes, but Do I?
I'm not sure it's absolutely necessary, but it certainly wouldn't hurt anything. Overbuilding is part of this game!
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post #12 of 53 Old 07-03-2018, 06:03 PM
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Quote:
Originally Posted by Rcris View Post
Original plan is to make double baffle, should I really need it. I just have to glue it and 4 more holes, but Do I?
Double baffle is normally so you can flush mount the drivers. If you dont care to do that, then you save some wood. And if yours will be hidden, I'd just not do it.

I'm not sure if you need it, but you might want a horizontal brace or two in that box.

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post #13 of 53 Old 07-03-2018, 06:18 PM - Thread Starter
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Double baffle is normally so you can flush mount the drivers. If you dont care to do that, then you save some wood. And if yours will be hidden, I'd just not do it.

I'm not sure if you need it, but you might want a horizontal brace or two in that box.
Sure, I will add few single sticks in them .
These will go behind the screen
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post #14 of 53 Old 07-03-2018, 06:20 PM - Thread Starter
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Gotta to make a trip to Walmart for some pillows
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post #15 of 53 Old 07-04-2018, 10:03 AM - Thread Starter
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post #16 of 53 Old 07-04-2018, 10:45 AM
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https://www.lowes.com/pd/M-D-17-ft-G...rstrip/1096043
will this work for sealing the driver ?
Sure will.
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post #17 of 53 Old 07-04-2018, 01:19 PM - Thread Starter
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today's progress , added few braces and waiting for paint to dry


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post #18 of 53 Old 07-04-2018, 01:28 PM - Thread Starter
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I'm not too worried on paint job as they'll be hid anyway
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post #19 of 53 Old 07-05-2018, 06:38 AM
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Found a seller on Ebay here in Italy who could have a batch arriving in a while, 2 cone boxes!
Will go the same route of the OP, for my tiny four cones availability!

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post #20 of 53 Old 07-05-2018, 01:48 PM - Thread Starter
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One done, replaced with 1262 sealed sub and bass seems to quadrupled. Its insane amount of bass but I need to rerun the audessey I guess.


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post #21 of 53 Old 07-18-2018, 05:49 AM
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So the title of the thread should be modified? Exact type of this drive? Post Audissey result?

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post #22 of 53 Old 07-18-2018, 09:37 AM
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Nice build!

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post #23 of 53 Old 07-18-2018, 05:05 PM
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Quote:
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One done, replaced with 1262 sealed sub and bass seems to quadrupled.
you replaced one with 4.... seems legit.
nice build, look forward to your results with multiples
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post #24 of 53 Old 08-16-2018, 09:02 AM - Thread Starter
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Came back from vacation to receive this letter from my new neighbor , just one box did this, can't believe it. There is definitely 50ft from my wall to his bedroom wall.


Setting up to build the second one this weekend




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post #25 of 53 Old 08-16-2018, 09:40 AM
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Lol

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post #26 of 53 Old 08-16-2018, 09:41 AM
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Came back from vacation to receive this letter from my new neighbor , just one box did this, can't believe it. There is definitely 50ft from my wall to his bedroom wall.


Setting up to build the second one this weekend




I find that hard to believe. 50 feet away and using just 4 of those little guys? It can't be that loud outside.
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post #27 of 53 Old 08-16-2018, 09:52 AM
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Came back from vacation to receive this letter from my new neighbor , just one box did this, can't believe it. There is definitely 50ft from my wall to his bedroom wall.


Setting up to build the second one this weekend




Sounds like you need to invite them over next time to watch the movie . That and potentially look at some bass traps inside (and maybe even build something to help dampen the noise outside)....

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post #28 of 53 Old 08-16-2018, 10:43 AM
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I've had both of my side neighbors text me to tell me their bedroom was rattling from the THT's. I still had more in the tank too

Not sure about you, but aside from a feeling kinda bad for messing with the neighbors, it was a great feeling to get some feedback on the performance of the project lol.
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post #29 of 53 Old 08-16-2018, 10:45 AM
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Quote:
Originally Posted by Rcris View Post
Came back from vacation to receive this letter from my new neighbor , just one box did this, can't believe it. There is definitely 50ft from my wall to his bedroom wall.


Setting up to build the second one this weekend




For some reason, my brain automatically filled in the name as Inigo Montoya.

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post #30 of 53 Old 08-16-2018, 11:00 AM
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Quote:
Originally Posted by Rcris View Post
Came back from vacation to receive this letter from my new neighbor , just one box did this, can't believe it. There is definitely 50ft from my wall to his bedroom wall.

Setting up to build the second one this weekend
Wow. I'd frame that one and put it on the wall. Kind of a badge of honor wouldn't you say?
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