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Horn for 12MB1000

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Category: Plans
Forum Name: Po rn Horns
Forum Description: Discussion / Questions about the Po rn Horns
Printed Date: 17 April 2024 at 4:43pm
Software Version: Web Wiz Forums 12.06 -

Topic: Horn for 12MB1000
Posted By: DYSW
Subject: Horn for 12MB1000
Date Posted: 09 December 2006 at 5:50am
Hey everybody.
Iwe been lurking for quite some time now. This lead to i bought 4 12mb1000 from eighteensound -
But i was a bit unlucky with the wooden horn i built myself. The fact that its only 40x40 from the front and 20 cm deep might have something to do with it. But im running out of time. got alot of jobs in januar, so i need 4 horns that really works on these units.
Iwe looked at the limmer. But that is so overprices that its out of my reech. would be more than what i payed for the units.
Have anybody tried these units with any horns or have any ideas what to do ?
BEst regards
Mikkel koch
KPLsound bornholm.

Posted By: Tekasis
Date Posted: 09 December 2006 at 9:26am
Hi mate, I've never heard of these 12''s by 18Sound until now.
Had a read up on them & they seem very good.
I see they are a mid-bass driver, what are you planning to play through them, Mid range or Bass ?

Posted By: jethrocker
Date Posted: 09 December 2006 at 10:37pm
You could try comparing the T/S specs with other 12" cones used in available horn designs. The MT122 is deesigned around the PD123er I think. If the specs came up similar they should work nice in that design.
Also read up on the - FAQ on the speakerplans homepage. If any of the specs differ, that might help you decide if it's going to let the driver down in that design or not.
The FAQ also has a decent explanation of T/S specs if you need it..

Posted By: Mircea Bartic
Date Posted: 10 December 2006 at 5:54am
I'm sorry to tell you, but your drivers do not work in mt122..

I did a sim and there are some nasty peaks an nulls in the response

maybe a direct radiating design ?...

general manager & head designer at nexus-acoustics research" rel="nofollow -

Ex Nexus_3

Posted By: Mircea Bartic
Date Posted: 10 December 2006 at 6:07am

this is the imput screen for the mt122

this is the imput screen for my version for 12mb1000

as you can see the horn has a bit larger mouth and  a higher compression ratio

general manager & head designer at nexus-acoustics research" rel="nofollow -

Ex Nexus_3

Posted By: DYSW
Date Posted: 11 December 2006 at 5:50am
Thx so much for the replies. Really nice - Mircea Bartic   <
the last diagram looks nice imo. No nasty peaks. But u sound like u know alot about it so MT122 are not a option.
Range wise i had thought of let them play from 150-200 to 1700-2000. I run a 4 way system so i have a 4 15" that plays from 50 to 200. Mainly to take the presure of the 12" units.
What i was looking for is a link to a company that sells premade horns or if anybody had any used ones. the problem is time, i don`t have the time to build that much myself anymore. I really wanna do it but with family and everything its just not posible.
Im also considering just using them in a reflex system. they have a pretty high DB From 100 to app 2000 so it would be useable. but not matching very well to my Das 2" drivers that delivers much more DBs.
LMK what u think.
Best regards
Mikkel koch

Posted By: jethrocker
Date Posted: 11 December 2006 at 1:09pm
Well, ironically enough, you posted in the forum entitled "porn horns"..Porn Horns are a ready made fibreglass horn section for a 12" driver, available from Pro Audio Parts I think. All you'd have to do is build a basic box/baffle assembly  to drop them into.
As for freq. range of the porn horn, and if your drivers will suit, can't say, you'll have to work that one out for yourself.. Good luck.

Posted By: DYSW
Date Posted: 12 December 2006 at 5:54am
Now for the big Question. How
Should i spend 500-600 pounds and tests them out and sell them after the test if they don`t work  ? Just seems like a big waste if they don`t work.
I have some problems with figuring out if the last diagram from - Mircea Bartic   can be made into a regular cabinet or not.
Again thx for your replies.

Posted By: Mircea Bartic
Date Posted: 12 December 2006 at 6:07am

the last diagram is for a MT122 with a slight larger mouth area (increase widht of enclosure) and a smaller throat (modify horn entry to suit your needs)

it is still preety much an mt122

I trhink I'll try to simulate a porn horn tonight to see if it can work with your diver (presumung the phaseplug fits on your cone...  hmmm)

general manager & head designer at nexus-acoustics research" rel="nofollow -

Ex Nexus_3

Posted By: Mircea Bartic
Date Posted: 12 December 2006 at 6:09am
by the way

you'll have to cross them at about 1000-1200Hz to some meaty 2" Drivers...

general manager & head designer at nexus-acoustics research" rel="nofollow -

Ex Nexus_3

Posted By: DYSW
Date Posted: 18 December 2006 at 3:49pm
Thx so much for the replies.

PM 4 ya.


Posted By: meko
Date Posted: 28 February 2012 at 9:37pm
Sorry to resurrect this old one, but I am in need for a diy horn to fit the 18sound 12MB1000.
How exactly could the MT122 horn shape be altered?
Or does someone have any knowledge of a diy horn specifically designed for the 12MB1000?
I searched an awful lot but did not find anything except the old JBL 4512 enclosure that "seems to work" with the 18sound... but no valid information really.

what I need should play from 200Hz to about 800Hz...1kHz max.


Posted By: meko
Date Posted: 01 March 2012 at 8:21pm
does anyone have any info on this?
I'd really appreciate it.

Posted By: hond
Date Posted: 19 March 2012 at 12:07am
I suggest you go learn about how to design a horn.. there are threads about programs like hornresp which help you with the math and the sims 

Posted By: Wrek0ne
Date Posted: 23 April 2012 at 2:45pm
I can help you out with a design that I have (just) finished that may help but the 12" will play from around 100-300Hz in a band pass design, with another horn loaded 10" playing from 300-1kHz. The design has been made with the same foot print a the MT112, and is only around 15cm taller. PM me if your interested and ill finish the Sketch Up and send through the details (things still need to be tweaked but its 95% done in its current state)

>>>I also haven't tested this driver in it but I have had success with most other drivers, and if you are interested I could sim this for you<<<

Poll this!

Posted By: rubric
Date Posted: 01 March 2021 at 9:57am
Any chance you could share the design/sim on this one? Currently trying to design a horn in hornresp for the 12mb1000 and am having a bit of trouble - thanks!

Date Posted: 01 March 2021 at 12:03pm
JBL 4512  horn......just google for plans...easy to make and cranks out 100 Hz to 1200 Hz approx. Use two stacked on each side of stage..............................VECTORSONICS

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