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Learning horn resp, need some advice.

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SouthwestCNC View Drop Down
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    Posted: 14 January 2017 at 1:06pm
Hi there, I thought it's about time I start learning how to simulate horn response. Getting on quite well with it and now like to understand how using the ported throats works geometry wise. If the port vents into a horn throat does the length of the port include the remaining length to front of the horn its vented into or not. Or in that scenario does the port then become a tapered port?

TIA
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Post Options Post Options   Thanks (0) Thanks(0)   Quote odc04r Quote  Post ReplyReply Direct Link To This Post Posted: 14 January 2017 at 1:18pm
Good plan, always fun to learn something new.

Sound like a slightly odd design though, ports usually tend to end in a chamber as they combine with its volume to make a resonance. You'll have to be careful to avoid taking up throat area if you terminate them there else which is quite a critical design parameter for a horn. Are you trying to make a tapped horn of some decription?

But generally no, you would not include the rest of a horns length in a port wherever it terminated. The port resonance is defined by the mass of air in it, its compliance, and the same for the chamber it is in. If you terminate a port in odd ways and odd places, then you need to consider end correction for it to get accurate results too.

Maybe post up a diagram for some comment.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SouthwestCNC Quote  Post ReplyReply Direct Link To This Post Posted: 14 January 2017 at 1:24pm
That's great advice thanks. There's no plan I just saw the function available in horn resp and was wondering how that worked. I'll try drawing something up as to what I'd imagine that function is used for, might even be missunderstanding it. Thanks.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SouthwestCNC Quote  Post ReplyReply Direct Link To This Post Posted: 14 January 2017 at 1:37pm


Edited by SouthwestCNC - 14 January 2017 at 1:49pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bitSmasher Quote  Post ReplyReply Direct Link To This Post Posted: 14 January 2017 at 2:14pm
Can't advise directly, but there's a huge amount of info on DIYAudio subwoofer forum - Mr McBean posts on there
"Battery Acid Sound System" blog hopefully happening in 2017
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SouthwestCNC Quote  Post ReplyReply Direct Link To This Post Posted: 14 January 2017 at 2:16pm
Didn't know that. Thank you!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote odc04r Quote  Post ReplyReply Direct Link To This Post Posted: 14 January 2017 at 5:11pm
Looks like you're trying to port the rear chamber of a front loaded horn into the horn path at some point. Not a common design! Trying to recombine the rearward wave of the driver with the horn loaded forward will be tricky. I am not sure if horn response will necessarily let you do that either. It has the capability for tapped horns but I am not sure if you can port a rear chamber to a horn node.

Akabak will very much let you do this and simulate it, but need windows xp or earlier and requires scripting to get a sim running.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote corell Quote  Post ReplyReply Direct Link To This Post Posted: 14 January 2017 at 5:11pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gen0me Quote  Post ReplyReply Direct Link To This Post Posted: 14 January 2017 at 5:55pm
Originally posted by corell corell wrote:

????? Not in hornresp.



Is that what you mean in 1st post: Ap or Ap1.


Edited by gen0me - 14 January 2017 at 6:09pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SouthwestCNC Quote  Post ReplyReply Direct Link To This Post Posted: 14 January 2017 at 6:40pm
Thanks odc04r I'm learning, really I'm just trying to understand the function of selecting throat ported under the option rear vented. But sounds like it means something other than what I'd imagined.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote fatfreddiescat Quote  Post ReplyReply Direct Link To This Post Posted: 14 January 2017 at 6:41pm
Newer version of horn response has the option to port into the throat of the horn, not had much luck with it so far, tried modeling my boxes but not had any result from hornresponse that comes close to my measured results. I will give it another go when I get time.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SouthwestCNC Quote  Post ReplyReply Direct Link To This Post Posted: 14 January 2017 at 6:44pm
Useful info Corell. Thank you.
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