need help with tapped horn calculation...

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morpheus82

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Joined 2004
Hi tb46, in my last post I was referring to "epa"'s design. Is it a tapped horn?
Well, TH was my first idea, because I wanted to try something "new" for me, and the building is not so hard.
If the result is not satisfactory, I can consider another kind of loading, if it's not too hard to build.
 
E

epa

Member
Joined 2010
morpheus82 said:
Thanks A LOT epa, you are right, I did not seected "tapped horn" in the driver arrangement.
Sorry for my stupid question, I have always seen TH with S4>S1, is it still a TH if S4<S1?
What is the difference between the 2 systems?
Have you chacked also the displacement?
Click to expand...
well its not actualy a tapped horn but a tqwtp,wich is infact a tapped horn reversed (sort of:))
a tapped horns starts small and become's bigger at the end.
a tqwtp starts big and becommes smaller towards the end.
it al depends on the driver,and wat you are looking for.
a tapped horn has more output,and a tqwtp has more bandwith.
i also moddeled a straight pipe (s1=s2=s3=s4)(what should we call that ?):D

its basicly the same principal,you can model a tqwtp the same as th in hr.
hope this helps:)
regards erik

edit\the pic shows the output @ x-max
 
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tb46

Member
Joined 2006
Hi morpheus82,

Epa's numbers refer to bjorno's design, a T-TQWT. The driver is the problem. For a TH you end up with a much bigger enclosure, see attachment, I would recommend against it.

Regards,
 

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morpheus82

Member
Joined 2004
wow...I made some mistake in calculation...
I did some simulations with a "reverse" TH, starting with 500cm2, and with s3=150cm2, length about 2meters. Not bad really...
One question, do I have to take into account the length of the "bend" in the middle of the horn?
And, if S4 is on the back of the driver, how can I calculate the l34? As a quarter of circumference?
 
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bjorno

R.I.P.
Joined 2005
morpheus82 said:
Well, not really changing...
My idea is to try the tapped horn, because I'm curious to hear the result.
Then my target for volume is around 80 liters, but I can change this value...
Thanks bjorno for your simulation, looks very good! But you used parabolic sections, how can I achieve easily a parabolic section? Conical one is very easy...
Click to expand...

Sorry for this very late picture answer:

b:)
 

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morpheus82

Member
Joined 2004
thanks Bjorno, your response looks very good...;)
I want to try this first:
An externally hosted image should be here but it was not working when we last tested it.

It's in comparison with yours, mine is not so flat, but I can go a little deeper in frequency...With 10V I reach the xmax @ 25Hz, not bad!:D
Even if it's far from being flat...
I will give it a try since the box is almost finished...
 
E

epa

Member
Joined 2010
morpheus82 said:
One more question...
I set S1=550cm2, S2=500, L12=15cm, S3=175cm2, L23=180cm, S4=700cm2 and L34=15cm.
So S4>>S3.
Hornresp gives a warning about accuracy of the calculations, do I have to take care about it? Is the response much different?
Click to expand...
the mouth expands verry quickly,as a result it wil unload at that point,
its diffecult to predict the outcome(hence the warning)
there is no golden rule:)
maybe bild a beta box first?
 
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