Nomograph for -6dB point dispersion angle Frequency vs. Diameter

[Ian Mackenzie]

Dr DB

Check the A290 fin and no fin response on the website

Just email Yuchi

He is a nice guy and l have shared communication

The George Ausberger studio monitors use fin horns

They are an industry bench mark

The devil as always with audio is in the details

I would also talk to some seos users

IMHO imaging is as much about diffraction-time domain related aberrations as it is about dispersion

It’s worth reading Earl Geddes website on the topic

[Dr.db]

@Earl:
The "vertical" arrangement of the midhorn seems to work great for imaging.
I believe I have to read the mentioned thread from GT to understand this...

As seen in your posted graph, a linear frequency response under angle seems to be a major factor, right?

@ivica:
The fins seem to affect the high-frequencies more than the mid-frequencies and this results in a different dispersion over frequency. Did I get you right?

@Ian:
The yuichi-horn without the fins seems to have a rising freq-response on axis. The yuichi-horn with fins is rather flat on axis. But what does is tell about the imaging ability?

[Ian Mackenzie]

My recommendation is to contact Yuichi via email and ask your questions

[ivica]

@Earl:
The "vertical" arrangement of the midhorn seems to work great for imaging.
I believe I have to read the mentioned thread from GT to understand this...

As seen in your posted graph, a linear frequency response under angle seems to be a major factor, right?

@ivica:
The fins seem to affect the high-frequencies more than the mid-frequencies and this results in a different dispersion over frequency. Did I get you right?

@Ian:
The yuichi-horn without the fins seems to have a rising freq-response on axis. The yuichi-horn with fins is rather flat on axis. But what does is tell about the imaging ability?

Hi Dr.db,

Neglecting some dispersion possible irregularities on the mid frequencies that can be seen on some horns, Yuichi A290 horn fins have main role to enhance horizontal horn dispersion over 10kHz. As Ian said, without fins it can be seen rising F/R ON AXIS, but off axis the dispersion would decline (due to the piston radiation pattern characteristic), so I would suggest to use A290 (original designed) with the fins.
Introducing a kind of diffraction slot in the horn throat (2328) with 2350 horn an improvement in the horizontal horn dispersion can be get without using "fin type solution"

http://www.jblpro.com/pub/obsolete/Radial_Horns1.pdf

almost the same used in DD66/67K , H9500, H9800....

but 'fins type solutions' is used in the A290 solution, TAD TH-4001 solution or mentioned Augspurger solution.

http://www.geocities.jp/arai401204/Horn/A290/A290.html
http://www.geocities.jp/arai401204/H...xperiment.html
http://quarkconcept.online.fr/tad2401.htm
http://audio-database.com/PIONEER-EX...401twin-e.html
http://www.audioheritage.org/vbullet...l=1#post195146

Interestingly on the ebay.com may be helpful:
https://www.ebay.com/itm/Play-wood-h...-/302444249871



regards
ivica

[Dr.db]

@Ian:
I have tried to email yuichi several months ago, but he hasn´t responded yet.

@Ivica:
Thanks for all the links!

.

BTW, does the yuichi-a290 has a 90° horizontal dispersion like the original TAD ?

If I´d use a 10" midwoofer up to the yuichi, which crossover would you recommend?