Diy throat adaptor for compression driver

zedda

Member
2014-07-05 1:50 pm
gaeta
Hi :)
It's possible to use a hf10ak (1"exit 1,75" vc) on lth142 (1,4"exit) making an adaptor in wood or similar?
The lth142 horn it's built for a particular driver or it's built for all 1,4" driver?

I want to use this combination with active crossover and a 15ndl76 woofer.
Thanks :)
 

zedda

Member
2014-07-05 1:50 pm
gaeta
With this horn, faitalpro tried different driver...
Driver with more exit angle work very well...
The best response is from a driver with 29° exit angle...
My driver have 21° exit angle...
I don't know if it work correctly in a 1,4" horn

P.S. looking the tractrix standard profile it's impossible to create an appropriate adaptor... Near the throat the horn have zero angle...
 
Last edited:
With this horn, faitalpro tried different driver...
Driver with more exit angle work very well...
The best response is from a driver with 29° exit angle...
My driver have 21° exit angle...
I don't know if it work correctly in a 1,4" horn

P.S. looking the tractrix standard profile it's impossible to create an appropriate adaptor... Near the throat the horn have zero angle...
A wider angle driver may allow more lateral reflections off the horn sidewalls, reducing beaming, but adding more time smear.

The horn profile looks like it could be extended and reduced to 1" without any real problems, your driver's 21 degree angle is already wider than the throat angle.

The adapter could be made by laminating approximately 63mm of plywood together, the throat and driver plates using 5mm sized to fit.
Drill a 1" hole through, then use files to widen the throat to 1.4", matching the horn curve.

Or just buy the adapters...

Art
 

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  • LTH 142 W:Adaptor.png
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zedda

Member
2014-07-05 1:50 pm
gaeta
Thanks for the reply :)
I tought the tractrix is a standard profile... If the lth142 effectively have a exit angle quite pronunced I will buy it...
The best competitor is the xt1464...
Is more cheaper in italy...
But is too high (over 300mm) and too deep and it would be necessary a 900hz crossover... Too low for 1,75" vc...

If 900hz 24db active crossover it's possible (now for test, without rlc cell i use 1000hz 24db), which would you choose between the two horn?
 
Thanks for the reply :)
I tought the tractrix is a standard profile... If the lth142 effectively have a exit angle quite pronunced I will buy it...
The best competitor is the xt1464...
Is more cheaper in italy...
But is too high (over 300mm) and too deep and it would be necessary a 900hz crossover... Too low for 1,75" vc...

If 900hz 24db active crossover it's possible (now for test, without rlc cell i use 1000hz 24db), which would you choose between the two horn?
I would prefer the XT1464, it has more even coverage than the tractrix.