Favorite woodhorn ?

[Dr.db]

A friend of mine asked me for the best sounding midrange horn I know of, but I haven´t listened to most of them yet and have to ask you guys.
I can call the westlake aka 2397 my own and really like it.
But he is looking for a possible crossover of aprox. 500-600hz.

The yuichi horn which seems to be a TAD copy came to my mind. Seems to be highly regarded and without any imperfection.

But I have found some pics of a Yamamoto wood horn that looks mighty impressive. 80cm (32") wide and 33cm (13") tall :blink:
http://audio-heritage.jp/YAMAMOTO/unit/f280a.html
Any experience with this monster of a horn?


Regards,
Olaf

[ivica]

A friend of mine asked me for the best sounding midrange horn I know of, but I haven´t listened to most of them yet and have to ask you guys.
I can call the westlake aka 2397 my own and really like it.
But he is looking for a possible crossover of aprox. 500-600hz.

The yuichi horn which seems to be a TAD copy came to my mind. Seems to be highly regarded and without any imperfection.

But I have found some pics of a Yamamoto wood horn that looks mighty impressive. 80cm (32") wide and 33cm (13") tall :blink:
http://audio-heritage.jp/YAMAMOTO/unit/f280a.html
Any experience with this monster of a horn?


Regards,
Olaf

Hi Olaf,
May be You can start with Yuichi A290 wooden horn
http://www.geocities.jp/arai401204/Horn/A290/A290.html
as a lot of info can be find

reagrds
ivica

[Dr.db]

Hi Ivica,

yes indeed, the yuichi seems to fit his demands.
But we where wondering if there is a bigger version of this around?
He was thinking of using a JBL 2482 with phenolic diaphragm to inshure safe use from 500hz or even below.
But yuichi "only" supports safe crossover from 600hz and above...

[dn92]

I know several people using JBL 2" drivers on TH-4001 crossed at 500Hz of even a bit lower. I had several time the opportunity to listen to JBL 2450 or 2446 in such a configuration. This is working well. Arai290 is a bit different but you should be able to do the same.

[johanwholst]

This horns should be quite intresting, and about the same size as the larger yamamoto
I have not listened to it myself. Only the smaller version from autotech, but I am sure it would aound wonderful with a decent driver and imo it looks beautiful

78726

78727

It is also large enough to give proper loading down to 500hz if the driver is up for it

[Ian Mackenzie]

Going lower is not always the answer

Diaphragm excursion goes up and so does distortion

The polar response of the horn can change significantly at the bottom end too making crossover behaviour unpredictable

[Dr.db]

500hz on the yuichi a290 could work, but I like the idea of doubling the cutoff for actual crossover (2*290hz= 580hz)... As Ian said, goin to low may introduce more problems than benefits. At small levels a 500hz crossover probaply works well thou...

That´s the reason my buddy was looking for a bigger wood-horn than yuichi...
The Iwata shure looks impressive I have to say!

[ivica]

500hz on the yuichi a290 could work, .....

That´s the reason my buddy was looking for a bigger wood-horn than yuichi...
The Iwata shure looks impressive I have to say!

Hi,

but the horizontal dispersion a290 (with FINS) I would expect to be much, much more then Iwata horn type.

ivica

[yggdrasil]

Hi,

but the horizontal dispersion a290 (with FINS) I would expect to be much, much more then Iwata horn type.

ivica

Isn't narrow dispersion a HF issue?

@Dr.db: Did you say anything about the high crossover point?

Here's a picture of an Iwata horn used from ~200Hz if I remember correctly: http://www.audioheritage.org/vbulletin/showthread.php?20880-Mid-range-driver-advice-needed&p=208877&viewfull=1#post208877

[carolus]

....Here's a picture of an Iwata horn used from ~200Hz if I remember correctly: http://www.audioheritage.org/vbulletin/showthread.php?20880-Mid-range-driver-advice-needed&p=208877&viewfull=1#post208877

I think, it's an heavy adapted Iwata 2" horn (in DIY) ....
Best, ask it to or musical friend "mafuta" or ... "JDZA" ...
It's music .... I like it.
Karel

[Dr.db]

Yes, the dispersion of the Yuichi should be much better.
I actually think the yuichi might be the best of both worlds...

That Iwata looks freaking massive!
It should match well with a JBL 2482 or 2485 for a very low crossover, or what do you think? :)

He plans to use the mid-horn with either a ring-radiator or 1" high-horn.
In case of the yuichi he would go with a 2405 and 10khz crossover...
In case of a bigger midhorn matched with a 2482 he would go with a JBL 2426 in a small horn and ~3,5khz crossover...

[yggdrasil]

I believe that big Iwata was designed for the 3" 2490.

So - the goal is to use one horn from ~500Hz to 10KHz.

As you mention - the Yuichi 290 should be a good choice. Designing a bigger horn from scratch is a very difficult task to pull off. IME the most difficult tasks are getting a desired HF response, HF dispersion and flat (-ish) response curve.

The Iwata have been iterated on the forum before. Here's a post with the response curve: http://www.audioheritage.org/vbulletin/showthread.php?31481-Are-Iwata-horns-that-good&p=317612&viewfull=1#post317612

[carolus]

I believe that big Iwata was designed for the 3" 2490.

So - the goal is to use one horn from ~500Hz to 10KHz. .....

FI
@ Yggdrasil
@ dr.db

I count from 500Hz to 10kHz more than 4 octave .... perso my experiences, to much for driver & horn ....

Karel

[berga12]

Iwata or yuichi290


the yuichi seems the best for TAD driver, used also by TAD.

construction plans are also available for both.

I Listen 2441 on Iwata horn and it's way better than already good Jbl2350.

[Dr.db]

@yggdrasil:

Yes, aprox. 500-10.000hz is the goal, but if the horn would support a little lower than 500hz that would be in his interest.
But he doesn´t want to design a new horn, as he isn´t a professional at this.

Thanks for the link, very interesting.

@berga:

Which construction plans for Iwata do you know of?
Could you share these with us?

[berga12]

Hi, the same Iwata posted below.
I just Add the side of the horn.


788017880278803

[Dr.db]

Great, thank you :)

Looks very impressive!

[Kent Croy]

Hi Guys, I came across this website, I’m actually thinking of building a 2397 clone, but this looks really cool, Kent
http://www.allec.nl/products/The-best-speaker-we-can-make-and-explanation.-ALLEC-2A%252dbe.html

[Dr.db]

I know their are two different versions around, one has an internal height of aprox. 1,44" and the other should have 2".

I have build the smaller one which is very close to the JBL 2397. But I´m interested in the bigger one.
Are there any construction plans of these westlakes with 2" inner height?
Or are these the exact same dimensions as the smaller one except for the height ?

How do they actual differ in sound?
Westlake only uses the bigger one to about 4,5khz, is it´s frequency extension to the highs worse than the smaller one which is capable of 10khz ?

[wacu]

yamamoto f280a clone vs 290 vs 480 Arai))))
Yamamoto is simply a monster in comparison even with the 290 model
797617976279763

[Earl K]

Beautiful Work !!!

:)

[berga12]

impressive!

[Dr.db]

Thanks a lot for taking these pictures!
Very impressive, indeed.

How do the yamamoto f280a actually compare to the yuichi 290 in sound?
Which driver are you using?

[wacu]

Thanks a lot for taking these pictures!
Very impressive, indeed.

How do the yamamoto f280a actually compare to the yuichi 290 in sound?
Which driver are you using?
Thank you for your evaluation, believe this hellish labor-such a completed product.
I have several tad 4001, gauss 4000, radians, jbl 2441 - but the best gauss is, it just basses there.
But in the 2-way version, of course, Tad 4001
Yamamoto 280 much steeper allows you to build an unreal scene in comparison with Rey Audio RH-3.
Sorry for my english))7976679767

[berga12]

have you the exact construction plans for f280a?

[Dr.db]

have you the exact construction plans for f280a?

I´m interested too, is anyone aware of existing plans?

@wacu: Did you build these yourself?