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Bending mid horns

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Mark James View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark James Quote  Post ReplyReply Direct Link To This Post Posted: 13 February 2017 at 12:33am
i personaly cant see any reason to bend/fold a horn playing down to 1khz i mean that needs to be like less than a ft long? at most id imagine [too drunk to do exact maths atm but im sure its less than a foot?] do you realy need to bend it?
not saying you dont need to just asking
If you want people to feel the bass then a reflex design is probably best as you get the most air movement per decibel from those.      errrrr yes wtf?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SouthwestCNC Quote  Post ReplyReply Direct Link To This Post Posted: 13 February 2017 at 9:46am
Originally posted by gen0me gen0me wrote:

I checked them(DR200) but cant find any info how high is crossover. Only size of HF horns could get ROUGH idea. What are recommended speakers?

On intuition the directivity should be dictated by shape of bend end and exit of horn. Ofc bend should be narrow to keep similar patchlengths. Now I see where DR shapes came from.
Am I right? Whats DR directivity?


By narrow you mean remain conical also. Id imagine an exponential bend may have some effect on directivity even if only narrow.

Most of the bent horns ive seen are fully exponential, no good for arraying so I understand. Just wonder how a conical transition is possible in a bend and immediately after if your aiming for constant directivity.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DMorison Quote  Post ReplyReply Direct Link To This Post Posted: 13 February 2017 at 1:28pm
Originally posted by Mark James Mark James wrote:

i personaly cant see any reason to bend/fold a horn playing down to 1khz i mean that needs to be like less than a ft long? at most id imagine [too drunk to do exact maths atm but im sure its less than a foot?] do you realy need to bend it?
not saying you dont need to just asking
 
You're also too drunk to do exact reading at the moment apparently Wink
 
OP wants their mids to play from whereever their basses cut off up to 3-4kHz, not down to 1kHz.
 
 
 
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DMorison Quote  Post ReplyReply Direct Link To This Post Posted: 13 February 2017 at 1:32pm
Originally posted by gen0me gen0me wrote:

Does anyone has experience in bending horns. Im thinking about horn going to 3-4kHz. Very long horn. How far can I bend it?
 
Have you looked at Peter Morris's DIY 3 ways on soundforums.net?
He reckons that a 12" mid horn cab get up to about 600Hz usefully with a single bend, and used BMS coax compression drivers to reach down to meet that. 
Probably a lot more practical than stretching the (low)mids another 2.5 octaves higher.
HTH,
David.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SouthwestCNC Quote  Post ReplyReply Direct Link To This Post Posted: 13 February 2017 at 4:00pm
Ive heard its possible to get down to 370hz with a bms4590 and a straight horn just 350mm in length. Will find out soon as im making one.

Think genome is looking for longer throw.


Edited by SouthwestCNC - 13 February 2017 at 4:02pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gen0me Quote  Post ReplyReply Direct Link To This Post Posted: 13 February 2017 at 8:10pm
Originally posted by SouthwestCNC SouthwestCNC wrote:


By narrow you mean remain conical also. Id imagine an exponential bend may have some effect on directivity even if only narrow. 

Ofc exponential bend will have bigger patchlength differences but its not only "S bend entry" that counts but the whole design.
Originally posted by SouthwestCNC SouthwestCNC wrote:


Most of the bent horns ive seen are fully exponential, no good for arraying so I understand. Just wonder how a conical transition is possible in a bend and immediately after if your aiming for constant directivity.

Do you think it will move the center of bend exit?

Originally posted by DMorison DMorison wrote:

Have you looked at Peter Morris's DIY 3 ways on soundforums.net?
He reckons that a 12" mid horn cab get up to about 600Hz usefully with a single bend, and used BMS coax compression drivers to reach down to meet that. 
Probably a lot more practical than stretching the (low)mids another 2.5 octaves higher.
HTH,
David.

Yes thats an option but... thats basicly mine current design. Instead of 12" is 8" predicted +-100Hz to +-1kHz. So Instead of the current 3"VC 2" throat I could put there coaxial BMS. I wanted something else.

Edited by gen0me - 13 February 2017 at 8:14pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SouthwestCNC Quote  Post ReplyReply Direct Link To This Post Posted: 13 February 2017 at 9:11pm
Originally posted by gen0me gen0me wrote:

Originally posted by SouthwestCNC SouthwestCNC wrote:


By narrow you mean remain conical also. Id imagine an exponential bend may have some effect on directivity even if only narrow. 

Ofc exponential bend will have bigger patchlength differences but its not only "S bend entry" that counts but the whole design.
Originally posted by SouthwestCNC SouthwestCNC wrote:


Most of the bent horns ive seen are fully exponential, no good for arraying so I understand. Just wonder how a conical transition is possible in a bend and immediately after if your aiming for constant directivity.

Do you think it will move the center of bend exit?

Originally posted by DMorison DMorison wrote:

Have you looked at Peter Morris's DIY 3 ways on soundforums.net?
He reckons that a 12" mid horn cab get up to about 600Hz usefully with a single bend, and used BMS coax compression drivers to reach down to meet that. 
Probably a lot more practical than stretching the (low)mids another 2.5 octaves higher.
HTH,
David.


Yes thats an option but... thats basicly mine current design. Instead of 12" is 8" predicted +-100Hz to +-1kHz. So Instead of the current 3"VC 2" throat I could put there coaxial BMS. I wanted something else.


I retract my statement, I received an xt1465 horn today and that is completely exponential yet its cd is good. contrary to what ive read. I'm just learning about this stuff hence my questions. Comsol might shed some light on it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SouthwestCNC Quote  Post ReplyReply Direct Link To This Post Posted: 13 February 2017 at 9:20pm
Here is a image courtesy of teunos which would suggest it is possible if from the exit if not smoothly terminated due to reflections and I would hazard a guess to say this may happen if the bend is too tight or un smooth ie one horn is then transitioning into another but could be wrong.



Edited by SouthwestCNC - 13 February 2017 at 9:26pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gen0me Quote  Post ReplyReply Direct Link To This Post Posted: 13 February 2017 at 10:25pm
Oh thats beautifull visualisation.
Whats the program?
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Post Options Post Options   Thanks (1) Thanks(1)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 14 February 2017 at 1:15am
djk
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Post Options Post Options   Thanks (1) Thanks(1)   Quote odc04r Quote  Post ReplyReply Direct Link To This Post Posted: 14 February 2017 at 10:45am
Originally posted by gen0me gen0me wrote:

Oh thats beautifull visualisation.
Whats the program?


Comsol
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gen0me Quote  Post ReplyReply Direct Link To This Post Posted: 14 February 2017 at 8:43pm

http://www.audioheritage.org/vbulletin/attachment.php?s=891d6879c4ffbfc7010196f507fa82c7&attachmentid=53177&d=1317961911

Meyer Sound 833 (patented)

[/QUOTE]
How does it sound? What is comparison to straight horn and what is the high freq cutoff?
Unity comes into mind.

Hmm i think I saw HF drivers mounted like this:



Originally posted by _djk_ _djk_ wrote:


http://medias.audiofanzine.com/images/normal/meyer-sound-833-834-553021.jpg
(foam in the bend)


What is foam in the bend for?
So something like this
Originally posted by SouthwestCNC SouthwestCNC wrote:




wont happen?
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