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bee wrote: mr cubo him self would be the best person to answer this..... But its not a conventional horn........ the driver fires into the mouth and into the horn throat, the length of the horn is relitive to the length of the sound wave to keep everything in line..... a very clever design.....
if the driver was in a sealed box, on a horn the same as the cubo, it would not play as low...... the driver placement has a lot to do with why this cab works.....
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bjm362 wrote:
bee wrote: mr cubo him self would be the best person to answer this..... But its not a conventional horn........ the driver fires into the mouth and into the horn throat, the length of the horn is relitive to the length of the sound wave to keep everything in line..... a very clever design.....
if the driver was in a sealed box, on a horn the same as the cubo, it would not play as low...... the driver placement has a lot to do with why this cab works.....
Are you saying that by placing the driver in the mouth of the horn he is getting benefits of the horn from both sides as well as coupling the waves in phase from both front and back of the driver? BTW,thats what I really think is happening. The math to do this would be different than standard horn theory I am familiar with.
If so he has accomplished something I have been planning to attempt by a diferent method! Also his method results in significantly smaller cabinets !!! Thats a definite plus !
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Cubo15 wrote: That's a difficult one as it's explainable from so many different angles, I'll have to get back on that on Tuesday. In the mean time read up on tapped horns a bit (hint Tom Danley's post on the subject on diyaudio.com (subwoofer forum)), that will narrow down the amount of angled views.
Best regards
Cubo
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Its implied in the last two paragraphs of page 2,but I am not sure he didn't mean the inverse of what he said. Thats why I brought attention to it.Cubo15 wrote: I can not find the part were Danley supposably states that the tapped horn driver needs twice the Xmax, only that it has twice the Xmax.
Anyway you look at it your design is a success !!!Cubo15 wrote: Personally I see tapped horns as a form of band pass enclosures (with very abstracly seen) series tuned ports. BP enclosures often by choice limit band width in return for higher output within that band width.
Unlike a normal 6th order BP on a certain frequency(band-ish) the driver Sd is doubled.
Tapped horns are ussually designed with minimal chamber volumes in mind. In Cubo-ish designs (ARLS, T18, Bootybass) horn path length is replaced with chamber volume,
creating series tuned chamber/ ports. This often needs a large step up in chamber volume to work correctly.
The first Cubo prototype was configurable as both front loaded and rear loaded (tapped BP) horn, where both horns have the exact same horn dimensions and chamber volume, and the exact same internal/external volume.
The rear loaded version was much louder but less deep extending, resulting in the second prototype: A reduced horn mouth to reduce SPL at Fc-high and lower the tuning accordingly.
Best regards
Cubo
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