BL Horn Project Helix-5000

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This is my last project of Exponential BL Horn.
I tried to design sufficiently big construction,
but (almost) suitable to set up in normal room.
(what do you think about title "family scandal")
😀 😎

Some parameters:
Lenght of exponent is 5000 mm (34.4Hz for 1/2 wave lenght).
Throat area is 88 sq. cm.
Offset ratio is approx. 0.5
Mouth area is 0.45 sq. m.
Volume of chamber is 7 liters, but it is easy to reduce to 3.5-4 liters (tighter bass and smaller drive excursion).

Helix is suitable for Bulgarian Full Range Drivers - Ether 5/6, but fits also Fostex 206/7 and others.
 

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Hi,

what about mounting the driver with offset onto
the front baffle / into the pressure chamber ?

Looks possible without changing the folding, would bet
it will sound better then.

Yes i know, some people don't like to look at drivers mounted
offset. But others are interested in best sound mainly ...

Cheers
 
LineArray said:
Very ambitious, beautiful folding ...

Where to get the Ethers ?


Cheers

You can get Ethers from Asparuh Jeliazkov, designer of these drivers.
Phone number for contacts:
00359882203760, Kiril Kirilov (Asparuh doesn't speak english)
About driver offset...
Below I attached PDF with offset ratio 1.
 

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Take a look more carefully 😀
left view is with offset 1, right with 0.5
 

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  • var_1_2.jpg
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During my investigation into wave forming from the filter chamber to the throat a "funnel" approach always produced the better result. It may be nothing more than a slug of pressure at that point but it will affect the later wave form.

ron
 
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