Rerurn to Romy the Cat's Site
In the Forum: Horn-Loaded Speakers
In the Thread: Evaluation of tractrix curves based on visual surface reflections.
Post Subject: 10 Footer : Some DetailsPosted by jessie.dazzle on: 7/1/2006
Thanks for your comments Romy.
You should like this bit of news... I forgot to mention, these will be round-section horns...
And yes, they will be very heavy... Made from a metal armature and very thick, natural (hemp) fiber-reinforced, plaster. They will be mounted on wheels. I know it sounds like adobe hut construction... and one could easily imagine a sort of DIY-looking result, but I have a lot of experience working with these materials, and though the way they look is not of primary concern, I do know how to get professional-looking results.
About the back chamber : I will of course take your advice Romy and make the thing tombstone solid and air-tight. But could you explain...
After observing a pair of AK151s operating in free air, though only lightly driven, I just don't see how they can possibly generate so much pressure, as the cone barely moves!
The sound however, even in free air, is super encouraging.
I can't get over the thickness of the cast chassis (on par with the bell housing of an Alfa Romeo 5 speed gearbox!).
As for geometry of the bass horn, I am not yet at the point of needing to define the curve ... I have smaller horns to build first. But in order to plan for room placement, and physical relationship with the smaller horns, at this point my main concern on the bass horn is the central axis;
Option "J" : Straight (vertical) for most of the length, curving 90° before the mouth.
Option "C" : One big continuous curve (a sort of mega "Horn of Plenty").
As the C curve has a less sharp bend, that to me seems the better choice... but it does take more space.
Low Pass Filtering : I am certainly ignorant here (an advantage when undertaking major projects... otherwise I probably would not be attempting any of this), as I don't see the problem... I had simply planned to use a large induction coil with each AK151. ???
Time delay : Um yes... This to me seems the most threatening issue... But as I mentioned, these horns will be on wheels, free to move independently of the other horns. However, my room may not be large enough to accommodate the necessary staggering. This could lead to a near-field listening situation that would be out of scale with the horns. Which could in turn lead to me looking for another house.
Thanks again,
jd*Rerurn to Romy the Cat's Site