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In the Forum: Horn-Loaded Speakers
In the Thread: Evaluation of tractrix curves based on visual surface reflections.
Post Subject: Re: 10 Footer : Inverted J Central AxisPosted by jessie.dazzle on: 7/1/2006
Romy,
As always, thanks for your thoughts.
Regarding cone movement versus rear chamber pressure : I understand that low excursion explains to a great extent, the advantages of horn-loaded designs, I just don't understand how something that "does not move", can generate such pressure... I realize that this is taking place within a constrained volume, but still... Can a bird fly without flapping its wings?
Regarding J-Axis : The floor space in my room, though somewhat generous by Eruopean standards, it is still not huge, which presents a good argument for the J-Axis design... I have built computer models of horns using an inverted J-Axis, placing the mouth up high, just as you have shown in your drawing. This orientation places the driver on the floor, leaving some space down low for other horns. However, in my case, because the ceiling is 5 meters high, a bass horn with the mouth up high would be radiating into half space... the solid condrete walls would be closer.
The inverted J solution may require aiming the mouth down a bit (again, just as your drawing shows), due to lack of distance between the horns and the listening position.
(BTW, have you tried aiming your Fundamentals Channel horn down towards your listening position?)
The other option would be to take advantage of the high ceiling, and hang a pair of straight horns from the ceiling, aimed straight down at the listening postition... I have no idea what result such a set up might yield.
To be continued...
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