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Jack 12 build problem.
Posted: Fri Sep 21, 2018 9:20 pm
by CajunPlayer
I am building a Jack 12 for my bass rig. Everything was going along as expected till I wanted to install the horn braces. Oh, I got them in the center and all glued and tacked. Now, on to the Mouth Panel and the question.
Are the horn braces supposed to NOT touch the Mouth Panels? My Horn Braces stop about 1.5" from the front edge of the Throat Assembly. Are the Mouth Panels supposed to attach to the Throat Assembly with no additional bracing? . Did I do something wrong? I have checked and rechecked my measurements against the plans.
I have good shots of what I am talking about.
Any suggestions?
Robert in Baton Rouge, La
Re: Jack 12 build problem.
Posted: Fri Sep 21, 2018 9:35 pm
by Bill Fitzmaurice
You installed them facing the wrong way. From the plans: Cut two horn braces for a 112, six for a 212. Write on them how they install per the diagram. I can't see anything written on them.
Re: Jack 12 build problem.
Posted: Fri Sep 21, 2018 9:42 pm
by CajunPlayer
I compared my pic to the plans. What is the problem?
Re: Jack 12 build problem.
Posted: Fri Sep 21, 2018 9:46 pm
by CoronaOperator
An oscillating saw
like this one can unglue those panels without wrecking them.
Re: Jack 12 build problem.
Posted: Fri Sep 21, 2018 9:50 pm
by CajunPlayer
I have one of those saws. I am still unclear as to what I did wrong based on the plans and my photos.
If I glued them facing the wrong way, what way is the right way? I am not trying to be difficult, I just don't understand what is wrong.
ra
Re: Jack 12 build problem.
Posted: Fri Sep 21, 2018 9:59 pm
by CoronaOperator
Look at your scetchup model. It looks like you didn't make them big enough.
They need to go right to the edge of the vertical piece so that it will attach to the horn when that gets installed.
Re: Jack 12 build problem.
Posted: Fri Sep 21, 2018 10:01 pm
by CajunPlayer
OMG,,,, I see the problem..... I cut the angle out on the wrong edge. The way I have them, the braces stick out past the bottom of the cab..
I feel more than stupid right now.
Thanks... Hope I did not mess anyone up.
Thank you for the help.
ra
Re: Jack 12 build problem.
Posted: Fri Sep 21, 2018 10:03 pm
by CoronaOperator
Use your ocillating saw, you can save the piece and reuse it. Those saws don't have many uses but this is one area where they shine.
Re: Jack 12 build problem.
Posted: Sat Sep 22, 2018 12:59 am
by Tom Smit
- J12brace.png (178.47 KiB) Viewed 1879 times
The "green" edge should be against the throat panel, I believe.
Re: Jack 12 build problem.
Posted: Sat Sep 22, 2018 8:24 am
by Bill Fitzmaurice
Tom Smit wrote: ↑Sat Sep 22, 2018 12:59 am
The "green" edge should be against the throat panel, I believe.
+1.
Re: Jack 12 build problem.
Posted: Tue Sep 25, 2018 6:06 pm
by CajunPlayer
Ok, I got the little jewel built. Waiting on the speaker, tweeters, handles, jack plate, jacks, feet and rhino cover kit.
I am still unclear about the tweeter array - the flat one with 3 on each side..
My sketch up does not work or again I am too dumb to get it to work.
Where exactly do you mount the tweeter array on this cab?
Is there a simple picture with the tweeters mounted in the flat array mode?
Can you share?
As for the high pass and low pass filters, expressparts.com has some pre-built for about $55. Would one of the pre-built things work on these cabs?
Thanks again for all the help. I am old and getting decrepit. Not a good place to be to build complicated cabs.
Robert Aucoin.
Baton Rouge, La
Re: Jack 12 build problem.
Posted: Tue Sep 25, 2018 6:49 pm
by Bruce Weldy
CajunPlayer wrote: ↑Tue Sep 25, 2018 6:06 pm
Ok, I got the little jewel built. Waiting on the speaker, tweeters, handles, jack plate, jacks, feet and rhino cover kit.
I am still unclear about the tweeter array - the flat one with 3 on each side..
My sketch up does not work or again I am too dumb to get it to work.
Where exactly do you mount the tweeter array on this cab?
Is there a simple picture with the tweeters mounted in the flat array mode?
Can you share?
As for the high pass and low pass filters, expressparts.com has some pre-built for about $55. Would one of the pre-built things work on these cabs?
Thanks again for all the help. I am old and getting decrepit. Not a good place to be to build complicated cabs.
Robert Aucoin.
Baton Rouge, La
The mounting placement is described in the plans under Flat Tweeter Array. Two pieces of 1" plywood running vertically. Measurements for the positioning is there.
Do not use an off the shelf crossover. If you don't want to build one, then go to
https://www.speakerhardware.com/ and buy one there.
Re: Jack 12 build problem.
Posted: Wed Sep 26, 2018 9:04 am
by himhimself
Don't neglect the sketchup file. Take the time to download the viewer and play with it. The 3D drawings are great in conjunction with the plans, letting you fly around and zoom into little areas and see exactly how things should fit together. Especially useful when you've read the sentence or two in the plans and are still scratching your head as to what it should look like.
Re: Jack 12 build problem.
Posted: Wed Sep 26, 2018 5:31 pm
by NukePooch
himhimself wrote: ↑Wed Sep 26, 2018 9:04 am
Don't neglect the sketchup file. Take the time to download the viewer and play with it. The 3D drawings are great in conjunction with the plans, letting you fly around and zoom into little areas and see exactly how things should fit together. Especially useful when you've read the sentence or two in the plans and are still scratching your head as to what it should look like.
+1
The Sketchup is worth the time to get the program working. It's invaluable.
Re: Jack 12 build problem.
Posted: Thu Sep 27, 2018 4:05 am
by Chris_Allen
If it makes you feel any better, I did exactly the same, despite it being the second I had built.