Finally! Omni 12 Tall Boy build

High power and fidelity from an easy to build cabinet.
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CarterKraft
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Location: DFW

Re: Finally! Omni 12 Tall Boy build

#61 Post by CarterKraft »

The 150 horn I bought has female threads. The current APT-50 driver has male threads...
The APT-50 I have has female threads and this horn on ebay has what appear to be male threads... I have contacted the seller to see if they can confirm the thread gender.
apt150s male.jpg
Weldon Carter

CarterKraft
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Re: Finally! Omni 12 Tall Boy build

#62 Post by CarterKraft »

Seth wrote: Tue Sep 13, 2022 12:41 pm I'm curious to see what you're working with, so I can better understand your proposed solutions. Are you able to post a few pics of the mismatched parts, showing how they don't fit together?
Absolutely, due to my messed up camera on my phone I have gotten bad about not taking pictures...
When I get home tonight I can get some pictures to illustrate the conundrum but in the interim these pictures of some drivers on ebay might tell the tale.

This is the driver I have, it came with a 80x80mm horn = APT80.
You can see the APT3 adapter is still attached to it after someone removed the horn.
The horn I have has female threads to allow the male threads of the adapter or equivalent 1 3/8"-18 driver to screw into it.
apt50wadapt.jpg
Weldon Carter

CarterKraft
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Re: Finally! Omni 12 Tall Boy build

#63 Post by CarterKraft »

Here is a current production APT80 with male threaded driver and female threaded horn.
In short I need a old stock 150 horn or adapter or new APT50.
APT80.jpg
Weldon Carter

Bruce Weldy
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Location: New Braunfels, TX

Re: Finally! Omni 12 Tall Boy build

#64 Post by Bruce Weldy »

Looks like the best bet is to take out that waveguide, fill the hole and cut the round hole for the APT80. Or, just put a different driver on the back of the that waveguide you have in there.

6 - T39 3012LF
4 - OT12 2512
1 - T24
1 - SLA Pro
2 - XF210


"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."

CarterKraft
Posts: 255
Joined: Thu Oct 22, 2020 1:46 pm
Location: DFW

Re: Finally! Omni 12 Tall Boy build

#65 Post by CarterKraft »

The driver swap is the most ideal solution, it just works.
I am a glutton for punishment so machining an adapter to allow the connection to the 150 horn it is :bash:
Since the other cabinet calls for dual ASD's I will have no use for this driver if I don't use it.
Wish me luck. :fingers:
Weldon Carter

CarterKraft
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Re: Finally! Omni 12 Tall Boy build

#66 Post by CarterKraft »

To :horse:
20220913_192725.jpg
20220913_192809.jpg
Weldon Carter

CarterKraft
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Location: DFW

Re: Finally! Omni 12 Tall Boy build

#67 Post by CarterKraft »

2008ish is when the tweeter had the 1.5 female threads.
The 2010 catalog has the adapter in it but the apt50 has male threads.
I started on the adapter last night but had a thought that I should try the 80 first Incase the dispersion is actually too wide for my intended use (I don't think so) but it's easy enough to make a adapter plate for the cab to test.

From the 2008 catalog
Screenshot_20220914-180846_Chrome.jpg
Weldon Carter

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Chris_Allen
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Location: Huddersfield, UK

Re: Finally! Omni 12 Tall Boy build

#68 Post by Chris_Allen »

It wouldn't be right if everything was straightforward!

You'll get there in the end and it's going to sound amazing. I've used the Omni 12TB and I loved it, shame I can't play bass very well, or should I say, shame I play bass like a guitarist.
Built:
6xDR200, 2xT39, 2xT48, 2xJack110, 1xOmni10.5, 1xAutotuba, 1xT18, 1xSLA Pro, 1xW8, 1xW10

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Seth
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Re: Finally! Omni 12 Tall Boy build

#69 Post by Seth »

If it were me (I don't have a lathe) I'd be really tempted to attempt cutting off the threaded portions of each part and gluing the stock threads to the new horn.

Anxious to see where this goes! :popcorn:
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded

Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421

CarterKraft
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Re: Finally! Omni 12 Tall Boy build

#70 Post by CarterKraft »

Chris_Allen wrote: Thu Sep 15, 2022 12:57 pm It wouldn't be right if everything was straightforward!

You'll get there in the end and it's going to sound amazing. I've used the Omni 12TB and I loved it, shame I can't play bass very well, or should I say, shame I play bass like a guitarist.
If it was easy everyone would do it :slap:
Really it's just me being cheap and trying to use driver I got.
I am going to try and not mess up any parts permanently so that I can UN-DO all this tinkering.
Seth wrote: Thu Sep 15, 2022 1:06 pm If it were me (I don't have a lathe) I'd be really tempted to attempt cutting off the threaded portions of each part and gluing the stock threads to the new horn.

Anxious to see where this goes! :popcorn:
That was my first thought...
But since the old horns/adapters are not available doing so in the event of failure would result in ruining a APT80 and a 100x50 horn flare...
It is a possibility though still...
Weldon Carter

Grant Bunter
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Re: Finally! Omni 12 Tall Boy build

#71 Post by Grant Bunter »

I recently bought a square 4.5" horn off ebay for not many $, out of China for the same purpose, to add a compression driver to my 4 x 10 bass cab.
So, it might take some time to find, but waiting for an eminence NOS APT50 horn might take longer.
The APT80 horn is still available and should fit.

Here's the store page of the seller I bought from:
https://www.ebay.com.au/str/scarlettche ... 3561.l2563
Built:
DR 250: x 2 melded array, 2x CD horn, March 2012 plans.
T39's: 4 x 20" KL3010LF , 2 x 28" 3012LF.
WH8: x 6 with melded array wired series/parallel.
Bunter's Audio and Lighting "like"s would be most appreciated...

CarterKraft
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Location: DFW

Re: Finally! Omni 12 Tall Boy build

#72 Post by CarterKraft »

Pretty happy for my 1st and second thread I have ever cut.
20220917_150422.jpg
20220917_150404.jpg
20220917_150344.jpg
Weldon Carter

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Seth
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Re: Finally! Omni 12 Tall Boy build

#73 Post by Seth »

Dude, that looks bitchen!
(California Speak, sorry)
Build in process - 2 WH6, one Alpha 6a loaded, one PRV Audio 6MB250-NDY loaded

Two 2x6 shorty SLA Pro's
One T39, 16", 3012LF loaded
Tall AutoTuba, 20" wide, 2x 8" MCM 55-2421
TruckTuba, 8½" wide, 2x 8" MCM 55-2421

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Tom Smit
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Location: Sarnia, Ont. Canada

Re: Finally! Omni 12 Tall Boy build

#74 Post by Tom Smit »

Reaally good job!
TomS

CarterKraft
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Location: DFW

Re: Finally! Omni 12 Tall Boy build

#75 Post by CarterKraft »

Thanks guys, I can't believe I pulled it off 😂

I have it running on the KABD 4100 off a 120v power supply. The DSP kicked my ass at first, if the volume control is in the woofer channel there is no output on that line. This was using a "pre made" DSP template.
If I delete the volume control I get output, not really sure what is wrong there.

I'm going have to try and get some help on the crossover frequencys and slopes for the 3 way, I am not even sure if it's good or bad at this point more testing is needed.
Weldon Carter

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