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In the Forum: Horn-Loaded Speakers
In the Thread: Horn loaded ribbons and other Vasyachkin’s tangents....
Post Subject: I'm still don’t get what you’re trying to do.Posted by Romy the Cat on: 11/2/2008
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 Vasyachkin wrote: |
| i will give you this much - horn loading ribbons is fundamentally not as advantageous as horn loading dynamic drivers. this is because ribbon mass is already close to airload mass (in theory could even be less) and little extra efficiency can be extracted by means of an acoustical impedance transformer as the impedance is matched to begin with. |
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Well, in most of horn to accomplish effective EQ the virtual dynamic mass of the driver need to be co-measurable with horn’s air-mass applied to the throat surface (let call it throat’s reactance). That is why the very-very-very shallow horns might be used with ribbons (like the Water Drop tweeter) but as soon you need to EQ with horns lower frequencies then you are in troubles.
| Vasyachkin wrote: |
| my ONLY motivation in horn-loading a ribbon is directivity control. perhaps i should have used the word waveguide instead of horn.
i would not use any kind of compression ratio. the horn could be almost a constant directivity or with some mild progressive rate of expansion. again it would not be used to boost any frequencies but merely to shape directivity. |
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Why would you need it? BTW, I generally do not undesired the whole idea of waveguiding… I think it cames from people who practice too wrong science…
| Vasyachkin wrote: |
| you say that extra vertical dispersion is BAD. yes it is. but that entirely depends on what you call extra ? if you have 3 inches of vertical sweet spot at first and you expand it to 3 feet then i don't call this extra. i call this just enough. |
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I do not call extra vertical dispersion is BAD but I was asking why do you need it. Conventional ribbons have 30-40 degrees, even the Water Drop that insultingly tall and thin has 20 degrees. If you are at 8 feet for instance then what 3 inches of vertical sweet spot are you talking about? Do not bend the axis of your drivers and you won’t have any “3 inches of sweet spot”. BTW, the dimension of sweet spot has nothing to do with dispersion patters of a tweeter.
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