Collaborative Tapped horn project - Page 27 - diyAudio
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Old 26th April 2007, 02:33 PM   #261
freddi is offline freddi  United States
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IIRC (?) Tom said something to effect that fs might be chosen higher than path. Is that 37lb 12" driver built in China?
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Old 26th April 2007, 03:48 PM   #262
MaVo is offline MaVo  Germany
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i just saw an error in my script. doesnt change much in the graph.

The 140 in the script should be a 141 like this, since the radiator needs to be at the end of the horn:
Radiator 'Rad1' Def='D20' Node=141 HD={xT} WD={x20}

Btw one can tap the driver into different places in the horn by changing the driver nodes:
Driver 'D1' Def='830500' Node=2=0=100=140
Node=100=140 is the end/beginning of the horn.
Node=110=130 would be just about in the middle.
putting the driver in the middle of the horn makes the bottom and top more peaky. end position seems to be better for flat response.
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Old 26th April 2007, 04:59 PM   #263
freddi is offline freddi  United States
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being akabak & math challenged. I'd like to know if there are overlay kludge strategies which almost work with regular simulator which do front and rear load.
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Old 26th April 2007, 05:01 PM   #264
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Hey Paul,

I think I posted my schematic for TH which is sorta hard to translate into an eclosure without a crossectional drawing representing the enclosure and showing the what portions of the eclosure are represented by the schematic.

The one thing that I can see in mavos script that I did and he did not do, Is I created a paralell path of nodes that flow from the rear of the driver back to the throat. I have not confirmation on weather the acoustic entities in ths program are uni directional or bi directional in terms of signal flow.

I basically used all ducts and Air masses.

I started by figuring out how the Band pass example in the manual was layed out.

I haven't dived to deep into the program yet I think there a lot of syntaxt that can be used that is not generated by the basic Value entry screens.

Where if you try and design a duct it needs you to figure the x sectional area and plug it in, where you can clearly see that in the bandpass example that, they are deriving the duct values from L x W x H. Perhaps the math becomes a little different if the ducts are calculated as rectangualr as opposed to a cross sectional equivalent???

Anyhow its not the simplest program to use. My advice is to start with your flow chart/schematic and then start trying to model it.

Good luck

Antone-
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Old 26th April 2007, 07:23 PM   #265
MaVo is offline MaVo  Germany
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Looking at the exaple script in the AkAbak Manual on page 67 / 68 i figured, that ducts are two-directional. This corresponds with the duct element, which has four nodes. One input and one output for both directions, i assume. somewhere in the manual they mention that one only has to define two nodes for convenience, which could mean that the other two are mirrors. In the example they only use one duct for each physical part in the enclosure, even if sound can travel through it forward an backwards. Does this make sense?
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Old 26th April 2007, 09:18 PM   #266
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Well I haven't tried the 4 node connection yet, but turning off the rear driver nodes certainly causes the graph to radically change.

One thing that I find Very Odd about my aKaBak preditions thus far is that,

The Driver tapped near the mouth model, resembles more closely my measures of the driver tapped near the center of the box.

and Vice Versa. I can't quite figure out why.

Antone-
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Old 26th April 2007, 09:23 PM   #267
AKN is offline AKN  Sweden
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Hi Patrick Bateman,

Quote:
I bought a pair of these a while back. If I build a tapped horn, I'm going to do it with the Diyma 12. It's Thiele-Small is comparable to the LAB 12, but it's superior in a few ways:
- it's cheaper
- it has more xmax
- it has a flatter BL curve
Do you have you any source for kippel and/or dumax measurements on Eminence LAB-12?
I am looking for these measurements.
__________________
/ Anders
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Old 27th April 2007, 06:28 PM   #268
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Here are Z photos of my TH proto type

, no bracing at the moment It certainly needs it though!!

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Any thoughts?

Antone-
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Old 27th April 2007, 06:42 PM   #269
contour is offline contour  Netherlands
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Hello,

Internal layout looks good. But I would quickly add a LOT of bracing!

Best regards,

Walt
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Old 28th April 2007, 02:11 AM   #270
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Well The Final Verdict is in

Click the image to open in full size.

Unfortunately I can't add any more bracing into this proto type.

I added quite a bit and it shure the hell isn't enough for full tilt

What the hell happened to my notch. Those air leaks sure changed the response!!!

Antone-
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