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Old 10th September 2013, 12:01 PM   #1
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Default Pics DIY Yuichi 290Hz Wood Horn

Have started a new system build featuring:

Yuichi 290Hz wood horn with massive Altec 288 drivers
Mid bass in sealed cab, driver to be decided
Lab12 sub
MiniDSP for sub, passive for horn
Custom new 6 channel amp from Holton Precision Audio (Tasmania).

High End Audio MOSFET Amplifiers - Amplifier Modules - DIY Amp Modules - DIY Audio - Amp Kit

Exciting.

Using lovely Euro birch ply in mix of 18 and 24mm.

CNC'd design Yuichi for easy cutting and assembly.

Temporary use of Altec 8005 multi cell horn...which sounds wonderful.
Attached Images
File Type: jpg dry run.jpg (55.5 KB, 1852 views)
File Type: jpg rear view adapter.jpg (92.5 KB, 1820 views)
File Type: jpg top view.jpg (78.8 KB, 1789 views)
File Type: jpg port in place.jpg (62.2 KB, 1763 views)
File Type: jpg finished pair.jpg (56.1 KB, 1735 views)
File Type: jpg Altec 1005 multi cell 2.jpg (68.0 KB, 679 views)
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Old 10th September 2013, 08:31 PM   #2
Pano is offline Pano  United States
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Interesting stuff! The Yuchi looks sort of like a multi-cell or sectoral horn, but the with the segments near the throat. Please keep up up to date.
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Old 11th September 2013, 12:26 PM   #3
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Mid bass cabs now built to final baffle stage. Dimensions approx. 63cm wide x 35cm tall x 40cm deep.



Birch ply used on the bulk of the panels, with odd shapes of ply added inside for bulk and reduction of standing waves. Extra bracing still to be added.



Heavy buggers.
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File Type: jpg photo (3).jpg (105.2 KB, 304 views)
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Old 14th September 2013, 01:14 PM   #4
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Today I finished the mid bass and tested the first driver, Magnavox 12-inch (full range). This sounded absolutely fantastic. The cabs had added pieces of wood pieces glued in, plus 3 walls lined with wool fibre.

Alnico magnet, high sensitivity.

MiniDSP set with 150Hz xover for the Lab12's....and 150Hz for Mag's.

The Leak valve amp sounded best on the bass module (vs the "pro" solid state 100-watt amp). For fun, using mini class D small amp for the Magnavox. This system would kill most modern systems...and I haven't even sorted out the big Yuichi/Altecs yet. Can't wait.
Attached Images
File Type: jpg inside box.jpg (122.4 KB, 309 views)
File Type: jpg wool inside.jpg (110.8 KB, 278 views)
File Type: jpg bass and mid.jpg (79.5 KB, 300 views)
File Type: jpg three speakers stacked.jpg (56.7 KB, 525 views)
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Old 14th September 2013, 02:38 PM   #5
AllenB is offline AllenB  Australia
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I like where this is going. How did you decide on this style of horn?
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Old 14th September 2013, 11:03 PM   #6
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Hi Allen

I've built dozens of horn speakers...Lowther, Tannoy, Altec, Klipsch, GOTO etc. I just love horns.

The above design is trying to build a 'reference' system, utilizing the best of the various components, ideal operating ranges etc.

After building a recent Altec/Great Plains 620 horn (with 416 bass and 902 driver), I knew I really loved the sound of Altec compression drivers.

A friend had lots of Altec gear...so I bought a pair of the MASSIVE 288 drivers...14kgs each. I then sampled some lovely horns, 511 and 8005. They worked a treat.

Being a DIYer, I just had to build something though...so along came the Yuichi...which many reviews suggest is one of the best horns around. I was bitten.

With a lot of my designs using CAD, it was only natural I did the Yuichi in CAD. A local Sydney supplier cut all the panels, and I have used lovely Euro Birch ply for the components. They weigh about 20Kgs each....63cm wide....but they look stunning, even though they're not finished.

See a few pics of other CNC projects of mine.
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File Type: jpg IMG_2855.JPG (572.1 KB, 688 views)
File Type: jpg photo (2).jpg (383.5 KB, 597 views)
File Type: jpg IMG_4771.JPG (670.9 KB, 524 views)
File Type: jpg IMG_3029.JPG (542.0 KB, 568 views)
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Old 15th September 2013, 04:07 AM   #7
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Today, I added back in the Altec horns and 288 drivers....getting to sound very good indeed...three amps all trying their best....the scale is very good. Crappy electronic cap on the horns at 500Hz...and MiniDSP for Lab12 bass (150Hz), then 550Hz for the mid bass.

I'm quite wrapped in the little Class D amp...not powerful, but very clean.

Have Mark Knoffler cranked up loud....

I should be outside with my electric plane and sander to get the large curve made on the Yuichi horns...but I'm petrified....!
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File Type: jpg three way with altec 8005.jpg (91.1 KB, 581 views)
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Old 15th September 2013, 04:45 AM   #8
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Love that snail!..................I seem to not be keen on a frame of references...........So if that's a 12", how-bought a 12LTA snuggled in there? Scale it up or down, don't care. Want some exotic wood to machine?? Got some!


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Old 15th September 2013, 06:48 AM   #9
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Quote:
Originally Posted by Richard Ellis View Post
Love that snail!..................I seem to not be keen on a frame of references...........So if that's a 12", how-bought a 12LTA snuggled in there? Scale it up or down, don't care. Want some exotic wood to machine?? Got some!


__________________________________________________ _________Rick.....
Yeh, 12 inch vintage Magnavox alnico.

Much relieved to have finished planing and sanding one horn section...took about two hours...quite hard...but got there. It will be next weekend before I get to the other three.

Have filled the horn adapters with resin/bog, then filed and sanded to get the right (and difficult) round to rectangular shape. A little bit of standard putty to fill any holes will finish that part off.
Attached Images
File Type: jpg throat with resin hard.jpg (41.5 KB, 420 views)
File Type: jpg rough plane.jpg (75.9 KB, 430 views)
File Type: jpg first section planed.jpg (65.5 KB, 455 views)
File Type: jpg first section planed 2.jpg (67.1 KB, 479 views)
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Old 15th September 2013, 07:29 PM   #10
fmena is offline fmena  Canada
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Default Question.....

Just curious as to which version of the 290 Yuichi did you use with the 288's... 290, 290S or 290FL are the ones that I see on his website. Thanks for the pics, it must have been a lot of work and it sure looks nice.
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