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13th July 2008, 11:14 AM
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#1 |
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diyAudio Member
Join Date: Nov 2004
Location: Sofia, Bulgaria
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BL Horn Project Helix-5000
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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Audio Researcher Daniel Petrov also known as widowmaker |
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13th July 2008, 11:59 PM
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#2 |
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diyAudio Member
Join Date: Mar 2008
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Very ambitious, beautiful folding ...
Where to get the Ethers ? Cheers |
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14th July 2008, 07:37 AM
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#3 |
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diyAudio Member
Join Date: Mar 2008
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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 |
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14th July 2008, 02:45 PM
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#4 | |
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diyAudio Member
Join Date: Nov 2004
Location: Sofia, Bulgaria
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Quote:
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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Audio Researcher Daniel Petrov also known as widowmaker |
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14th July 2008, 02:51 PM
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#5 |
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diyAudio Member
Join Date: Mar 2008
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Was it a joke, because you don't like side offset ?
Or do you mean everyone is free to introduce an offset if he likes ? I cannot see any difference between the drawings. But filenames differ. Maybe i am getting blind ... Sorry ... |
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14th July 2008, 03:06 PM
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#7 |
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diyAudio Member
Join Date: Nov 2004
Location: Sofia, Bulgaria
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Take a look more carefully
left view is with offset 1, right with 0.5
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Audio Researcher Daniel Petrov also known as widowmaker |
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14th July 2008, 03:11 PM
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#8 |
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diyAudio Member
Join Date: Nov 2004
Location: Sofia, Bulgaria
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This way is easier than changing the position of driver's hole onto front panel.
See also:
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Audio Researcher Daniel Petrov also known as widowmaker |
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14th July 2008, 04:02 PM
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#9 |
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diyAudio Member
Join Date: Jun 2008
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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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14th July 2008, 09:03 PM
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#10 | |
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diyAudio Member
Join Date: Mar 2008
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Quote:
OK i see ... what i meant is more like this ... the drawing is maybe somewhat exagerated, just to show what i mean. |
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