Help choosing and Autotech horn

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The Beat

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Joined 2013
#1
I'm putting my first system together and I'm in the middle of building some 2-way horn speakers. I've read many posts in these forums and others and realise that 2-way may not be ideal but that's my choice.

I've been looking at the Autotech horns and wonder if anyone could advise me on the sound differences I could expect running them from 500Hz and up.

The horns I'm looking at are:

e-jmlc-300
iwata-300
k-horn

I'm particularly interested to find any sound impressions of the k-horn which is modelled on a Klangfilm KL 51.

Paul
 
#4
djn, how is the dispersion of high frequences on these horns compared to tractrix horns? i have a 400hz tractrix horn right now and it has really not highfrequency dispersion.

Can you hear a difference on the two horns you mention?
 
#6
For me, I sit exactly in the middle so it is not an issue. With those two horns, I was running TAD 4001 CDs and they have great highs.... no issue. Currently I am running round 350hz wood tractrix horns with JBL compression drivers and I run the big *** Heil on top of that crossed over at 5000hz. Because of the round horn, I have a sweet spot of only 4-6" but it is the best imaging I've ever heard when in that spot.

The other two horns don't image as well, but we are only talking about 2% less so no big deal there either. But their imaging carries out to 20 degrees off axis...or so.
 
#7
I also have fantastic imaging from my Tractrix horn, the best I have had, but it is also my first horn speakers.
I did not understand you completely. Do you feel the e-jmlc-300 and iwata-300 have considerbly more/wider dispersion than the tractrix horn, if so, witch one had the most? If there is any difference.

Have you tryed an oswg?
 
#8
I've gotten mixed up with the terms here.

I'm trying to maximise the response at HF as I'm building a 2-way speaker. I know it's not going to be ideal but would like to optimise the HR response as much as possible by selecting the best horn for this. I think a smaller horn would work better but I also need it to cross at 500Hz.

Dispersion isn't something I'm going to worry about as much as there will be 2 people at centre of listening position more often than not.
 
#9
I think that the compression driver has more to do with high frequency response than the horn. That is why I mentioned the TAD 4001. They don't work well on round tractrix but are great for the e-jmlc-300 and iwata-300.

Here are the data sheets for the TAD 4001 and JBL 2441. I also included two pix of those drivers and in real life, the 2441 is dead by 10khz where the TAD is good to 18khz.

I run the 2441 on my system but only up to 5khz then I cross to the big *** Heil. I like the open sound of the Heil as it fires front and back.

http://www.hornstudio.de/4001.pdf

http://jgbouska.tripod.com/audio/2441_pdf2.jpg

HYLLE: I could not tell much difference between those horns with respect to dispersion...just not an issue. I've never tried the OSWG
 

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#12
Suggested Reading

The Beat said:
I'm putting my first system together and I'm in the middle of building some 2-way horn speakers. I've read many posts in these forums and others and realise that 2-way may not be ideal but that's my choice.

I've been looking at the Autotech horns and wonder if anyone could advise me on the sound differences I could expect running them from 500Hz and up.

The horns I'm looking at are:

e-jmlc-300
iwata-300
k-horn

I'm particularly interested to find any sound impressions of the k-horn which is modelled on a Klangfilm KL 51.

Paul
Click to expand...

You may find this information useful:


https://community.klipsch.com/index.php?/topic/131163-corner-horn-imaging-faq/

Regards
 
#13
My experince with my Tractrix horns is that it is only the person sitting completely optimally infront of the speakers that gets good highfrequency sound. I would like to have a relatively good sound on all 3 seats in my sofa.
djn, do I understand you correctly that you could not detect any difference in dispersion of sound from the 3 horn types you mentioned?
I would have thought the iwata might have better sound dispersion since it is not as "closed to the sides".
 
#14
Yes, I have that same effect with my tractrix horns but that is fine with me. I only sit in one spot and listen to music. My wife could care less about imagine. What I was trying to say about the e-jmlc-300 and iwata-300 horns was that they both have more than enough sweet spot so imagine remains coherent as you move left to right for quite a distance. Which one is better? They both do more than I need so I never measured them.
 
#17
jzagaja said:
e-jmlc - twice as much HF dispersion of Iwata and JMLC. Ears should be at horn level.
Iwata - like JMLC but mouth is rectangular.
K-horn - like JMLC but mouth is a quadratic.

For Iwata 300 and Radian 760NEOPB you have complete project (2-way) made by Jean-Michel Le Cléac'h - superb 3rd order crossover.
Click to expand...

Thanks for that. Do you have comment on the sound of the k-horn? It seems a jmlc horn is the current trend (probably not without good reason) and no one has been able to comment on the sound of the k-horn.

I already have crossovers built. Does this mean the iwata will be no good or just that it will maybe be not optimal sound with my crossovers?

Paul
 
#20
Lookswise, I'd go for the Iwata, but I like a bit more dispersion at high frequencies than those offer. Not necessarily CD, but at least reasonably constant in the horizontal plane to maybe 8kHz. As you say, if you sit in the sweet spot it's not a big issue, but my horns sometimes have an audience besides me 🙂
 
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