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Old 27th July 2011, 11:06 PM   #11
60ndown is offline 60ndown  United States
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Quote:
Originally Posted by Josh Ricci View Post
Maybe I will stumble on a good lower cost driver that can be used, though most simply do not have enough motor and mass.
please try hard for a lower cost driver that *might* work with less then 1000 watts, i dont have 4200 watts ......

but i might find 5 or 700 somewhere cheap one day.....

edit: in fact if you can tell me exactly which ts parameters are the important ones for this box i will also look.

or of course a 15" driver and ill just build it 18" wide instead of 24

Last edited by 60ndown; 27th July 2011 at 11:12 PM.
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Old 28th July 2011, 01:56 PM   #12
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Quote:
Originally Posted by Djim View Post
Hi Josh, I think you should drop the 18Sound 18W1000 from your list. That driver is (besides old) really not capable handling these wavelength in horns or TH's. It's low Xmax (7mm) is close to its dynamic excursion peak (approx 8,3mm) and the cone is not very strong.
To be honest i just went through my driver data base trying likely suspects and noting those that looked workable. I don't have any familiarity with that driver directly

So what you are saying is that this cone will fold up like a lawn chair at the first sign of real bass with volts behind it. Duly noted.
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Old 28th July 2011, 02:01 PM   #13
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Quote:
Originally Posted by 60ndown View Post
please try hard for a lower cost driver that *might* work with less then 1000 watts, i dont have 4200 watts ......

but i might find 5 or 700 somewhere cheap one day.....

edit: in fact if you can tell me exactly which ts parameters are the important ones for this box i will also look.

or of course a 15" driver and ill just build it 18" wide instead of 24
You don't need 4kw or even 2kw. All of the ones listed will work perfectly fine on 500w worth of amplifier. You won't find a magic driver that has 3-6db extra sensitivity over the others listed either. This enclosure was designed around a very powerful driver with an extreme amount of motor force, good xmax and a strong cone with a lot of SD. That is the kind of driver that works well in it. Unfortunately most more budget friendly drivers do not possess these attributes.

I cannot tell you what parameters to look for as there are none that will gurantee good performance in this cab. It is the sum of all the parts not any one or 2.
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Old 28th July 2011, 02:57 PM   #14
Djim is offline Djim  Netherlands
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Quote:
Originally Posted by Josh Ricci View Post
So what you are saying is that this cone will fold up like a lawn chair at the first sign of real bass with volts behind it. Duly noted.
Or it lightens up for a moment to shine
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Old 28th July 2011, 05:47 PM   #15
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Quote:
Originally Posted by Josh Ricci View Post
Here are some images of the cabinet design which was done in SolidWorks.
Josh,

I see you beefed up the bracing considerably from the Gjallerhorn.

The additional bracing is a good idea, but I would suggest cutting triangular shapes out of the braces, as they may reduce SPL with as much cross sectional area as they have as drawn.

Although I'm sold on the BC18SW115, a pair of Lab 12s worked pretty well in my Keystone TH, and had slightly higher sensitivity than the BC18SW115-4 IIRC.

Would you mind plugging four Lab 12's into the Hornresp sim for the Othorn?

Art
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Old 29th July 2011, 12:13 AM   #16
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4? I am not sure if they would fit without extensive modification or at all. 3 might be workable. I posted the HR input data. You could give it a whirl yourself you know.


Yeah I beefed the bracing a lot but I don't think it will affect things much whether it is skeletonized or not. My gut tells me it is negligible.
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Old 29th July 2011, 04:59 AM   #17
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Default OTHORN, w/4 Lab 12's

Quote:
Originally Posted by weltersys View Post
Josh,...Would you mind plugging four Lab 12's into the Hornresp sim for the Othorn? Art
Hi there Josh & Art: For curiousity and as Art requested, I ran HR using Josh's HR input with 4 Lab 12's in a TH 2s x2p with the following results:

16hz, 13 mm-disp
20hz-103.7spl,236w,7.6mm-disp,05.2ohms-imp (rising spl resopnse)
30hz-116.5spl,334w,0.3mm-disp,04.3ohms-imp (rising spl response)
38hz-126.4spl,039w,6.1mm-disp,34.5ohms-imp (spl peak)
60hz-118.8spl,330w,0.8mm-disp,04.4ohms-imp (spl dip)
90hz-126.6spl,040w,2.6mm-disp,34.8ohms-imp (spl peak)
105hz-123.3spl,313w,1.0mm-disp,04.6ohms-imp (spl dip)
115hz-131.0spl,198w, 0.9mmdisp, 7.2ohms-imp (spl peak)
140hz-120.9spl,325w,0.4mm-disp,04.4ohms-imp (spldip)
above 140hz, repeating peaks and dips
conclusion: from 10hz upward, there was no flat response areas...regards, Michael

Last edited by j.michael droke; 29th July 2011 at 05:03 AM. Reason: left out rising response comment...JMD
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Old 29th July 2011, 05:29 AM   #18
Djim is offline Djim  Netherlands
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Quote:
Originally Posted by weltersys View Post
Would you mind plugging four Lab 12's into the Hornresp sim for the Othorn?
Art, the Othorn is designed around a driver with very high BL figures. That means if you want to use Lab 12's you have to enlarge the cab to get similar response.
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Old 29th July 2011, 01:07 PM   #19
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Default pa TH with 4 lab 12

How about all the experts come together and start a new thread for the lab 12.
PA TH with 4 lab12
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Old 29th July 2011, 01:53 PM   #20
epa is offline epa  Netherlands
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