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real efficiency tham 15 martinsson
real efficiency tham 15 martinsson
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Old 10th July 2018, 08:33 PM   #31
Cableaddict is offline Cableaddict
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Quote:
Originally Posted by Brian Steele View Post
Perhaps, but then again look what happened to their measurements of the TH118...
True dat.


Quote:
Originally Posted by Brian Steele View Post
P
If we had a FLH with the same path length and throat and mouth sizes, I bet no-one would question that the resonance frequency would be lowered if we put two side by side. But then it's claimed that doesn't happen if those FLHs are replaced with THs. Why?
There is also an issue with impedance, and IIRC, compression ratio. - The same factors, as far as I can tell, that make Art's Keystone mouth extension work.

But let's face it, I don't fully understand ANY of the physics here. I'm just throwing out other factors to look at.
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Old 11th July 2018, 05:02 PM   #32
martinsson is offline martinsson  Sweden
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We toyed with the idea of achieving good multiple units coupling when we developed the THAM18, it's a tapped horn with a 63 deg expansion roughly from the center of the driver to the end of the last segment, the coupling area is ~3733cm2, since it did not hurt the results so we went with it.
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Old 11th July 2018, 05:47 PM   #33
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^ What was the result?
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Old 11th July 2018, 06:31 PM   #34
martinsson is offline martinsson  Sweden
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I'm sorry to say I do not know, one would have to compare it with a similar design with significantly less coupling area, but as I wrote it was juat a thought, and seeing that it only seemed to bring a slightly higher sensistivity in the upper passband range in the simulations we thought it did not hurt to keep it.
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Old 11th July 2018, 07:35 PM   #35
angelodj is offline angelodj
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Originally Posted by martinsson View Post
I'm sorry to say I do not know, one would have to compare it with a similar design with significantly less coupling area, but as I wrote it was juat a thought, and seeing that it only seemed to bring a slightly higher sensistivity in the upper passband range in the simulations we thought it did not hurt to keep it.
While for the tham15?
Are there any contraindications to uniting more units than tham 15? type 6 per side or 12 at the stage center?

I'm building 12 with 15ps100
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