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How to Make a New Wave Biradial Horn
How to Make a New Wave Biradial Horn
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Old 12th February 2018, 07:39 PM   #171
silverprout is offline silverprout  France
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Quote:
Originally Posted by Ro808 View Post
I have these as well.
I've bought some specific MDF (resin doped) with diferents colors in order to make great modular orientable enclosures.
Sherefore, Silverprout is working hard on the cabinets
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Old 12th February 2018, 07:41 PM   #172
Ro808 is online now Ro808  Netherlands
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The response graph I posted a few pages back is from a Sica 15"

You may consider this woofer, beautifully made (in Italy) with only a few parts from China:

Click the image to open in full size.

and this Compression driver (the Poly version, though the Titanium version is cheaper and also very good):

How to Make a New Wave Biradial Horn


Very high value for money, but compare prices between different shops, because they tend to vary.

Last edited by Ro808; 12th February 2018 at 07:45 PM.
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Old 12th February 2018, 07:58 PM   #173
Ro808 is online now Ro808  Netherlands
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Last week, I bought these 2nd hand, but new and unused in the box for 75:
Attached Images
File Type: jpg Sica LP 385.75-1800 WT 8 ? (Z008291)_MP_3.JPG (71.4 KB, 249 views)
File Type: jpg Sica LP 385.75-1800 WT 8 ? (Z008291)_MP_5.JPG (76.7 KB, 244 views)
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Old 12th February 2018, 08:01 PM   #174
Ro808 is online now Ro808  Netherlands
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Quote:
Originally Posted by silverprout View Post
I've bought some specific MDF (resin doped) with diferents colors in order to make great modular orientable enclosures.
Sherefore, Silverprout is working hard on the cabinets
Don't forget to post some pics!
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Old 12th February 2018, 09:04 PM   #175
silverprout is offline silverprout  France
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Quote:
Originally Posted by Ro808 View Post
Don't forget to post some pics!
I can't because it is not a radial horn !

Italy :
Sica
Faital pro
B&C
18 sound
RCF
Ciare

in tutto il mondo
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Old 12th February 2018, 09:46 PM   #176
Ro808 is online now Ro808  Netherlands
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Yes you can!
The throat is quite smooth, similar to the QSC/PRV waveguide:

Click the image to open in full size.

Response with the comp. driver from above:

How to Make a New Wave Biradial Horn



Actually, the Italian manufacturers are:

- Faital Pro
- Sica (Jensen)
- B&C = owner of 18Sound = owner of Ciare
- RCF.

All high quality brands.
The other brand that I would immediately add to that list, as far as quality is concerned, is from Spain: Beyma.

Last edited by Ro808; 12th February 2018 at 09:55 PM.
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Old 13th February 2018, 09:13 AM   #177
silverprout is offline silverprout  France
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I've forgot jensen

Excuse me but, this is not a WG, it's a real horn
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Old 14th February 2018, 02:42 AM   #178
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By definition of Dr. Geddes:

"With the “waveguide” approach, one can find that precise contour that allows the wavefront to progress to the shape that is required at the mouth to achieve the desired directivity. This is done with minimal diffraction and the resulting sound quality is distinctly improved. To me this is a waveguide – when there is a minimum of diffraction used to achieve the end result of directivity control. This can only be done through complex analysis and clearly, not every horn is a waveguide under this definition.

These days it is possible to use FEA or a large number of other techniques on devices that have varying cross sections to calculate their directivity. Doesn’t this then make them waveguides? That’s actually a good question, but has been shown to be somewhat academic."


It's deeper and its initial expansion rate at the throat is lower compared to many known waveguides, which isn't necessarily a bad thing. I skipped the SEOS for this reason. Does this make it a typical horn? I don't think so.
The polars aren't too bad and it definately doesn't sound like a typical (diffraction) horn. I think I'll customize mine somewhat by adding roundovers at the mouth. Might even make a mold from the innards with added roundovers and "press" a horntop in liquid wood.
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File Type: png Sica Polars.png (110.0 KB, 45 views)

Last edited by Ro808; 14th February 2018 at 02:50 AM.
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Old 14th February 2018, 08:09 AM   #179
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The horn that i've choosen is a very simple asymetric exponential profile with a discontinuity in the begining of the throat.
Therfore the directivity is constant and the acoustic energy is concentrated on a narrower lobe, wich mean that the efficiency is higher.
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Old 14th February 2018, 02:40 PM   #180
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Yep, I was able to overlay an exponential curve and draw a line from the center of the throat tangent to the walls, which would disqualify it as a waveguide and make it a real...

Click the image to open in full size.

Last edited by Ro808; 14th February 2018 at 03:04 PM.
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